The cause of periodicity of properties (a) Increasing atomic radius (b) Increasing atomic weights (c) Number of electrons in the valency orbit (d) The recurrence of similar outer electronic configuration

The cause of periodicity of properties (a) Increasing atomic radius (b) Increasing atomic weights (c) Number of electrons in the valency orbit (d) The recurrence of similar outer electronic configuration
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The cause of periodicity is the recurrence of similar

Description : The cause of periodicity is the recurrence of similar

Last Answer : electronic configuration

a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science

Description : a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science

Last Answer : (a) The repetition of same properties after definite interval is called periodicity in properties. (b) It is because they have same valence electrons therefore, have similar properties. (c) ... to right in a period because atomic size goes on decreasing and effective nuclear charge increases.

(3) the number of electrons orbiting around the nucleus Explanation: The chemical behavior of an atom is determined by the number of electrons on its outer shell. As for the chemical bonding properties of the atom, the electron configuration determines how it will bond, with what it will bond, and in what ratio atoms will bond to form the 20,000,000 different substances on Earth.

Description : (3) the number of electrons orbiting around the nucleus Explanation: The chemical behavior of an atom is determined by the number of electrons on its outer shell. As for the chemical bonding properties of ... , and in what ratio atoms will bond to form the 20,000,000 different substances on Earth.

Last Answer : Methyl phenyl ether can be obtained by reacting - (1) phenolate ions and methyl iodide (2) methoxide ions and bromobenzene (3) methanol and phenol (4) bromobenzene and methyl bromide

The repetition of property after a certain interval called ------? A. Electron efinity B. Atomic radius C. periodicity of property (Answer) D. none of these

Description : The repetition of property after a certain interval called ------? A. Electron efinity B. Atomic radius C. periodicity of property (Answer) D. none of these

Last Answer : C. periodicity of property (Answer)

Atoms of different elements have - (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configuration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons

Description : Atoms of different elements have - (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configuration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons

Last Answer : (3) different atomic number and different number of valence electrons Explanation: Each element's atoms have a different number of protons, neutrons, and electrons, which is why they have different ... Their reactivity also varies because of the number and activeness of the electrons in the atom.

Atoms of different elements have (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configu-ration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons

Description : Atoms of different elements have (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configu-ration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons

Last Answer : different atomic number and different number of valence electrons

The number of electrons in the outer most orbit of carbon atom is?

Description : The number of electrons in the outer most orbit of carbon atom is?

Last Answer : The number of electrons in the outer most orbit of carbon atom is 4.

In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses. He found that every eighth element had properties similar to that of the first. He called it the - (1) Law of Pentamates (2) Law of musical notes (3) Law of Octaves (4) None of the above

Description : In 1866, John Newlands, an English scientist, arranged the then known elements in the order of increasing atomic masses. He found that every eighth element had properties similar to that of the first. He called it ... of Pentamates (2) Law of musical notes (3) Law of Octaves (4) None of the above

Last Answer : (3) Law of Octaves Explanation: Newlands compared his discovery to the octaves found in music and thus, he called it the ‘Law of Octaves’. It is also known as ‘Newlands’ Law of Octaves’.

Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements

Description : Law of octaves says that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of elements

Last Answer : 7

Which one is different for the neutral atoms of the isotopes of an element? (A) Atomic weights (B) Atomic numbers (C) Number of protons (D) Number of electrons

Description : Which one is different for the neutral atoms of the isotopes of an element? (A) Atomic weights (B) Atomic numbers (C) Number of protons (D) Number of electrons

Last Answer : (A) Atomic weights

Which one is different for the neutral atoms of the isotopes of an element? (A) Atomic weights (B) Atomic numbers (C) Number of protons (D) Number of electrons

Description : Which one is different for the neutral atoms of the isotopes of an element? (A) Atomic weights (B) Atomic numbers (C) Number of protons (D) Number of electrons

Last Answer : (A) Atomic weights

Which group of elements have an outer electronic configuration of S-2-P-6?

Description : Which group of elements have an outer electronic configuration of S-2-P-6?

Last Answer : ANSWER: NOBLE GASES

Which of the following groups of elements have an OUTER ELECTRONIC configuration of S-2-P-2? w) halogens x) Nitrogen-Phosphorus Group y) Carbon-Silicon Group z) Boron-Aluminum Group

Description : Which of the following groups of elements have an OUTER ELECTRONIC configuration of S-2-P-2? w) halogens x) Nitrogen-Phosphorus Group y) Carbon-Silicon Group z) Boron-Aluminum Group

Last Answer : ANSWER: Y -- CARBON-SILICON GROUP

The rays are given off by a radioactive element from A)Nucleus B)Valence electrons C)All the orbits D)Outer orbit

Description : The rays are given off by a radioactive element from A)Nucleus B)Valence electrons C)All the orbits D)Outer orbit

Last Answer : The rays are given off by a radioactive element from A)Nucleus B)Valence electrons C)All the orbits ... electrons C. all the orbits D. outer orbit

Electrons in the outer orbit are called:

Description : Electrons in the outer orbit are called: A. nuclei B. valences C. waves D. shells

Last Answer : Electrons in the outer orbit are called: valences

How is the periodicity of properties dependent upon the number of protons in an atom?

Description : How is the periodicity of properties dependent upon the number of protons in an atom?

Last Answer : The number of protons is equal to atomic number. The periodicity of chemical properties depends on the outermost shell of electrons.

The periodicity of repetition of properties in Newland’s law was

Description : The periodicity of repetition of properties in Newland’s law was

Last Answer : eight.

Isotopes of an element have different (A) Mass number (B) Electronic configuration (C) Nuclear charge (D) Chemical properties

Description : Isotopes of an element have different (A) Mass number (B) Electronic configuration (C) Nuclear charge (D) Chemical properties

Last Answer : (A) Mass number

Isotopes of an element have different (A) Mass number (B) Electronic configuration (C) Nuclear charge (D) Chemical properties

Description : Isotopes of an element have different (A) Mass number (B) Electronic configuration (C) Nuclear charge (D) Chemical properties

Last Answer : (A) Mass number

The electronic configuration of an atom having atomic number `20' is – (1) 2, 8, 10 (2) 2, 6, 8, 4 (3) 2, 8, 8, 2 (4) 2, 10, 8

Description : The electronic configuration of an atom having atomic number `20' is – (1) 2, 8, 10 (2) 2, 6, 8, 4 (3) 2, 8, 8, 2 (4) 2, 10, 8

Last Answer : (3) 2, 8, 8, 2 Explanation: Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.

Electronic configuration of Element Atomic number 20 is –

Description : Electronic configuration of Element Atomic number 20 is –

Last Answer : 2, 8, 8, 2

Isotopes of an element have the same (A) Number of neutrons (B) Mass number (C) Electronic configuration (D) Atomic weight

Description : Isotopes of an element have the same (A) Number of neutrons (B) Mass number (C) Electronic configuration (D) Atomic weight

Last Answer : (C) Electronic configuration

Write the electronic configuration of scandium having atomic number 21.

Description : Write the electronic configuration of scandium having atomic number 21.

Last Answer : Ans-Sc = [Ar]3d1 4S2

The electronic configuration of an atom having atomic number '20' is?

Description : The electronic configuration of an atom having atomic number '20' is?

Last Answer : 2, 8, 8, 2

The electronic configuration of an atom having atomic number ‘20’ is (1) 2, 8, 10 (2) 2, 6, 8, 4 (3) 2, 8, 8, 2 (4) 2, 10, 8

Description : The electronic configuration of an atom having atomic number ‘20’ is (1) 2, 8, 10 (2) 2, 6, 8, 4 (3) 2, 8, 8, 2 (4) 2, 10, 8 

Last Answer : 2, 8, 8, 2

The element with the minimum atomic number having 8 electrons in the outer most shell is what?

Description : The element with the minimum atomic number having 8 electrons in the outer most shell is what?

Last Answer : Answer: Neon.

An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science

Description : An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science

Last Answer : Mass number = 4 Atomic number = 2 X is Helium. It has 0 valency and it will not react with any other atom because it has its outer shell filled.

Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons

Description : Compared to Chlorine, Bromine has: w) smaller atomic size x) higher density y) lower boiling point z) greater number of outer electrons

Last Answer : ANSWER: X -- HIGHER DENSITY

An atom has atomic number 12, what is its valency and name the element? -Chemistry 9th

Description : An atom has atomic number 12, what is its valency and name the element? -Chemistry 9th

Last Answer : Element with atomic number 12 is Magnesium (Mg). Electronic configuration of magnesium is 1s2 2s2 2p6 3s2. It has 2 e- in its outermost orbit and can donate these to form a stable octet. Hence, its valency is +2.

1. Where do Sweat glands occur in greatest number? 2. What is the electorate for a Panchayat? 3. The cause of fractional atomic weights of elements? 4. The second largest river basin in India is of which river? 5. Which Sikh Guru called himself the ‘Sachcha Badshah’?

Description : 1. Where do Sweat glands occur in greatest number? 2. What is the electorate for a Panchayat? 3. The cause of fractional atomic weights of elements? 4. The second largest river basin in India is ... 19. Why does Mumbai receives more rainfall than Pune? 20. What was the real name of Tantiya Tope?

Last Answer : Answer : 1 1. In the skin of the armpits 2. The Gram Sabha 3. The presence of Isotopes 4. Godavari 5. Guru Hargovind 6. Friedrich Engels 7. Cooperation 8. 30 9. Krishna Basin 10. ... Birds from reptiles 18. Dr. Rajendra Prasad 19. Because mumbai is on the windward side 20. Ramchandra Panduranga

Difference between Valency and Valence electrons ? -Chemistry

Description : Difference between Valency and Valence electrons ? -Chemistry

Last Answer : 1 ) Valency : The ability to gain, loose and sharing of electrons is valency / combinig capacity atoms of other elements is valency. 2 ) Valence elctrons : Electrons present in the outermost shell of the atom is valence electrons.

Define: i) Valency ii) Valence electrons.

Description : Define: i) Valency ii) Valence electrons. 

Last Answer : Valency:- The number of electrons donated (lose) or accepted (gain) or shared by atom of an element in order to complete its octet & attain stability is called as Valency.  Valence electrons: ... in the outermost orbit of an atom determine the valency of an atom and hence called valence electrons. 

Find the atomic structure of `._(12)^(24)Mg`. What is its valency?

Description : Find the atomic structure of `._(12)^(24)Mg`. What is its valency?

Last Answer : Find the atomic structure of `._(12)^(24)Mg`. What is its valency?

The two elements required to form substitutional solid solution should not have (A) Same crystalline structure (B) Same valency (C) Widely differing electronegativity (D) Same atomic sizes

Description : The two elements required to form substitutional solid solution should not have (A) Same crystalline structure (B) Same valency (C) Widely differing electronegativity (D) Same atomic sizes

Last Answer : C) Widely differing electronegativity

The cause of fractional atomic weights of elements? -Do You Know?

Description : The cause of fractional atomic weights of elements? -Do You Know?

Last Answer : Atomic masses of most of the elements in atomic mass units involve fractions because atomic mass of an element is the average of relative masses of its various isotopes. While taking average, the result appears as a fraction.

The cause of fractional atomic weights of elements?

Description : The cause of fractional atomic weights of elements?

Last Answer : The presence of Isotopes

The cause of fractional atomic weights of elements?

Description : The cause of fractional atomic weights of elements?

Last Answer : e presence of Isotopes

After subsiding a disturbance in the class room, the teacher's main concern should be Options: A) To punish all offenders and there by fore shall the recurrence of unacceptable behaviour B) To know the cause of the misbehaviour C) To provide closer supervision as a means of preventing the recurrence of the incident to reduce the demands made upon the individuals involved as a means of reducing tension D) To enlist group censure as a means of curbing future misbehaviour

Description : After subsiding a disturbance in the class room, the teacher's main concern should be Options: A) To punish all offenders and there by fore shall the recurrence of unacceptable behaviour B) To know ... a means of reducing tension D) To enlist group censure as a means of curbing future misbehaviour

Last Answer : B) To know the cause of the misbehaviour 

What is the term used to identify the amount of field strength required to cause the electrons to just miss the plate and return to the filament in a circular orbit?

Description : What is the term used to identify the amount of field strength required to cause the electrons to just miss the plate and return to the filament in a circular orbit?

Last Answer : The critical value of field strength

As one goes across a period in the periodic table, the ionization energy generally increases for one of the following reasons. Is it because of the increasing w) atomic radius x) melting point y) nuclear charge z) density

Description : As one goes across a period in the periodic table, the ionization energy generally increases for one of the following reasons. Is it because of the increasing w) atomic radius x) melting point y) nuclear charge z) density

Last Answer : ANSWER: Y -- NUCLEAR CHARGE

Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a current of 2 A. Atomic mass of silver=108 a

Description : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a current of 2 A. Atomic mass of silver=108 a

Last Answer : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a ... silver `=10.5xx10^(3) kg//m^(3)`.

Pick out the correct statement. (A) Loss of electrons from neutral atoms produces negative ions (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectively (C) Gain of electrons by neutral atoms form cations

Description : Pick out the correct statement. (A) Loss of electrons from neutral atoms produces negative ions (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectively (C) Gain of electrons by neutral atoms form cations

Last Answer : (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectivel

The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the average atomic mass of elements X and Z compare with the atomic mass of element Y? c) Which law of classification of elements is illustrated by this example? d) Give another example of a set of elements which are classified according to this law.

Description : The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the ... this example? d) Give another example of a set of elements which are classified according to this law.

Last Answer : a) The average atomic mass of X and Z = 7 39 2 46 2 23 b) The average atomic mass of X and Z is equal to the atomic mass of Y c) The law illustrated in this example is Dobereiner’s law of triads. d) Another example of Dobereiner’s law is Calcium, Strontium and Barium.

Rod: a. contains a cilium with a "9+0" configuration. b. contains 11-trans-retinaldehyde essential for the absorption of photons c. sheds its outer segment during the day d. depolarize in response to flashes of light

Description : Rod: a. contains a cilium with a "9+0" configuration. b. contains 11-trans-retinaldehyde essential for the absorption of photons c. sheds its outer segment during the day d. depolarize in response to flashes of light

Last Answer : contains a cilium with a "9+0" configuration.

The elements that have an outer electron configuration ns2 (read: n - s - 2) are called: w) halogens x) transition metals y) alkaline earths z) noble gases

Description : The elements that have an outer electron configuration ns2 (read: n - s - 2) are called: w) halogens x) transition metals y) alkaline earths z) noble gases

Last Answer : ANSWER: Y -- ALKALINE EARTHS

In which of the following groups, are the elements written in the descending order of their respective atomic weights? (a) Nitrogen, carbon, oxygen, hydrogen (b) Oxygen, argon, nitrogen, hydrogen (c) Oxygen, nitrogen, helium, hydrogen (d) Oxygen, nitrogen, helium, bromine

Description : In which of the following groups, are the elements written in the descending order of their respective atomic weights? (a) Nitrogen, carbon, oxygen, hydrogen (b) Oxygen, argon, nitrogen, hydrogen (c) Oxygen, nitrogen, helium, hydrogen (d) Oxygen, nitrogen, helium, bromine

Last Answer : Ans:(c)

In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone is.......... (Atomic weights in `g mol^(-1) : H = 1, C

Description : In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone is.......... (Atomic weights in `g mol^(-1) : H = 1, C

Last Answer : In the following reaction sequence, the amount of D (in g) formed from to moles of acetophenone ... product in each step is given in the parenthesis)

What atoms of the same element but with various atomic weights?

Description : What atoms of the same element but with various atomic weights?

Last Answer : These are the isotopes.

Who was the first American chemist to receive a Nobel Prize? He was selected in 1914 for his precise determination of atomic weights. w) Edward Frankland x) Theodore Richards y) John Bardeen z) Paul Dirac

Description : Who was the first American chemist to receive a Nobel Prize? He was selected in 1914 for his precise determination of atomic weights. w) Edward Frankland x) Theodore Richards y) John Bardeen z) Paul Dirac

Last Answer : ANSWER: X -- THEODORE RICHARDS

Recurrence of jellyfish sting?

Description : Recurrence of jellyfish sting?

Last Answer : Jellyfish stings can come and go for six weeks.