Description : Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same (A) Period increases (B) Period decreases (C) Group increases (D) Both 'b' & 'c'
Last Answer : Option D
Description : Among the elements of the 3rd period from Na to Ar, pick out the element: (L-2) (a). with highest first ionization enthalpy. (b). with largest atomic radius. (c). that is most reactive non-metal. (d). that is most reactive metal.
Last Answer : (a). Ar has highest first ionization enthalpy. (b). Na has large atomic radius (covalent radius). (c). Cl is more reactive non-metal in 3rd period. (d). Na is most reactive metal in third period.
Description : Of the following elements which has the largest atomic radius? w) Ba x) F y) C z) Be
Last Answer : ANSWER: W -- Ba
Description : Which of the following four elements has the largest atomic radius? Is it: w) strontium x) francium y) calcium z) bromine
Last Answer : ANSWER: X -- FRANCIUM
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
Description : Explain the trend of the following in group 13 elements : A. atomic radii B. ionization enthalpy C. electron affinity
Last Answer : Explain the trend of the following in group 13 elements : A. atomic radii B. ionization enthalpy C. electron affinity
Description : What element has an atomic number lower than that of aluminum and one less valence electron than group 16 elements?
Last Answer : Nitrogen
Description : Name this chemical element. The principal use of this element has been in solid-state electronic devices, notably transistors. Its position in the periodic table is in group "4A". The element's atomic number is 32 and its chemical symbol is Ge.
Last Answer : ANSWER: GERMANIUM
Description : Arrange the following elements in increasing order of their atomic size.
Last Answer : a) Li, Be, F, N a) F
Description : The order of increasing size of atomic radii among the elements O,S,Se and As
Last Answer : The order of increasing size of atomic radii among the elements O,S,Se and As A. `AsltSltOltSe` B. `SeltSltAsltO` C. `OltSltAsltSe` D. `OltSltSeltAs`
Description : What group appears to have members of the largest atomic radii for a given period?
Last Answer : This is the group 1.
Description : AS A GROUP, the halogens have the largest: w) atomic radii x) Boiling points y) electronegativities z) ionization energies
Last Answer : ANSWER: Y -- ELECTRONEGATIVITIES
Description : Taking first period and 17 th group of the periodic table, write gradation of properties with respect to the following: a) atomic size b) Ionisation energy c) electro positivity and electro negativity.
Last Answer : The elements of 1 st period are hydrogen and helium. a) Atomic size of hydrogen is larger then that of helium because atomic size decreases across a period. b) Ionisation energy of helium ... higher as it increases down the group. Electro negativity of fluorine as it decreases down the group.
Description : Why does atomic size of an atom increase down the group?
Last Answer : In moving down a group, new shell is added to the atom. There is an increase in the energy level. The distance of the outermost electron from the nucleus increases. This increases the size of the atom down the group.
Description : How many of the following properties increase down the group for nitrogen family (a) Atomic size (b) Acidic character of oxides (c) Boiling point of h
Last Answer : How many of the following properties increase down the group for nitrogen family (a) Atomic ... Metallic character (g) Basic character of hydrides
Description : How the atomic size vary in a group and across a period? Explain with suitable example.
Last Answer : How the atomic size vary in a group and across a period? Explain with suitable example.
Description : What nutrient group contains the largest portion of daily food servings of a horse?
Last Answer : Feel Free to Answer
Description : From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. ( ... . (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.
Last Answer : Ans. (a). The element chlorine (Cl) has the highest negative electron gain enthalpy. (b). The element cesium (Cs) has lowest ionization enthalpy. (c). The element fluorine F has lowest atomic radius. (d ... zero group (or group 18). (g). The element carbon (C) forms the largest number of compounds.
Description : Na, K, Li, which of the elements is the largest in size and which is the smallest in size ?
Last Answer : Among the elements Na, K, Li, Potassium ( K) is the largest in atomic size and Lithium ( Li) is the smallest in atomic size.
Description : Which country has the largest size of illiterate population in the age group of 15 + in the world ? -SST 10th
Last Answer : Bangladesh has the largest size of illiterate population in the age group of 15 + in the world.
Description : Choose the incorrect statement from the following: (a) The nuclear becomes weak if the nucleus contains too many protons compared to the number of neutrons (b) The nuclear force becomes weak if the ... (d) The nuclear force becomes very strong if the nucleus contains a large number of nucleons.
Last Answer : Ans:(d)
Description : 1The elements of the second period of the Periodic Table are given below: Li Be B C N O F (a) Give reason to explain why atomic radii decrease from Li to F. (b) Identify the most (i) metallic and (ii)non-metallic element. -Science
Last Answer : a) It is because nuclear charge increases due to increase in atomic number, therefore, force of attraction between nucleus and valence electrons increases, i.e. effective nuclear charge increases, hence ... element is ‘F’ because it can gain electrons easily due to smallest atomic size.
Description : There are two elements calcium (atomic number 20) and argon (atomic number 18) The mass number of both the elements is 40. They are therefore known as (a) isotones (b) isochores (c) isobars (d) isotopes
Last Answer : Ans:(c)
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
Description : The names of the scientists, Newlands, Mendeleev and Meyer are associated with the development of (a) Atomic structure (b) Metallurgy (c) Periodic table of elements (d) Discovery of elements
Description : Who Classified Elements based on atomic number?
Last Answer : Moseley
Description : Who Classified Elements based on atomic weight?
Last Answer : Mendeleev
Description : Elements with atomic number 89-103 are known as?
Last Answer : Actinides (radio active rare earths)
Description : Elements with atomic number 57-71 are known as?
Last Answer : Lanthanides (rare earths)
Description : The scientist who classified elements based on Atomic Values is?
Last Answer : Lothar Meyer
Description : Elements having same mass number and different atomic number are known as?
Last Answer : Isobars Eg: calcium — 40; Argon - 40
Description : The Russian chemist who said that the properties of elements are periodic function of their atomic mass is
Last Answer : Dmitri Mendeleev.
Description : The person in 1815 who suggested in that elements can be classified on the basis of atomic mass was
Last Answer : William Prout.
Description : What is the significance of atomic number in the modern classification of elements?
Last Answer : In the modern classification, elements are arranged in the increasing order of their atomic numbers.
Description : Atomic mass is not useful to construct the periodic table. Give reasons with an example. OR Why is atomic number is more useful than atomic mass to classify the elements?
Last Answer : Isotopes of an element have same atomic number but different atomic mass. They have to be placed in four places. This creates confusion because other elements occupied these positions.
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.
Description : The atomic number of hydrogen is 1. This implies that it contains _______ in its Kshell. (1) One neutron (2) One proton (3) One electron (4) None of the above
Last Answer : (3) One electron Explanation: This implies that Hydrogen has one electron in its K shell. Also, it requires one more electron to fill the K shell. So two hydrogen atoms share their electrons to form a molecule of hydrogen, H2.
Description : The atomic mass of an element is fractional, because (A) Of uncertainty principle (B) It may have isobars (C) It contains neutrons (D) It may have isotopes
Last Answer : (D) It may have isotopes
Description : The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is [IIT 1991] (A) 40.3 (B) 36.3 (C) 24.3 (D) 11.3
Last Answer : (C) 24.3
Description : Do we have (or will have soon) a periodic table of sub-atomic elements?
Last Answer : http://www.bing.com/images/search?q=subatomic+elements+chart&qpvt=sub+atomic+elements+chart&qpvt=sub+atomic+elements+chart&FORM=IGRE ?
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.
Description : A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic number 90 and atomic mass 234, the
Last Answer : A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic ... )^(234)Th` D. `._(91)^(234)Pa`
Description : Which of the atomic number represent the s-block elements ?
Last Answer : Which of the atomic number represent the s-block elements? a. 7, 15 b. 3, 12 c. 6, 14 d. 9, 17
Description : How are atomic emission spectra used to identify elements?
Last Answer : Atomic emission spectra are chracteristic for each element.
Description : What is the arragenment of all the known elements in order of their atomic numbers?
Last Answer : The list is often called the Periodic Table, given that it canbe arranged in ways which bring out the patterns in theirreactivities.
Description : How do the elements in period 4 to show the physical state of the elements changes as the atomic number increases?
Last Answer : The last members are bromine (liquid) and krypton (gas).
Description : How do the decimal places on the atomic masses of elements realate to isotopes?
Last Answer : The Atomic Mass of an element is the weighted average of massesof the isotopes of the element, weighted in proportion to theirabundance.
Description : Are the elements on the periodic table organized by their atomic number?
Last Answer : Yes. The elements are arranged in increasing order of atomic number.