What is the atomic number and mass ?

What is the atomic number and mass ?
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Be Atomic number 4 and mass 9
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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.

What is the number of electrons in an atom of atomic number Z and mass number A? -Do You Know?

Description : What is the number of electrons in an atom of atomic number Z and mass number A? -Do You Know?

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For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons , neutrons and electrons respectivel

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Last Answer : For an element , if atomic number (Z) and mass number (A) are 29 and 63 respectively . Then the number of protons ... C. 29 , 34 ,29 D. 29 , 29 , 29

Number of atoms of He in 100 amu of He is : (Atomic mass of He is 4) :-

Description : Number of atoms of He in 100 amu of He is : (Atomic mass of He is 4) :-

Last Answer : Number of atoms of He in 100 amu of He is : (Atomic mass of He is 4) :- A. 25 B. 100 C. 50 D. `100 xx 6 xx 10^(-23)`

(A) Nuclear isomers have same atomic number and same mass number but with different radioactive properties. `U_((A))` and `U_((Z))` are nuclear isomer

Description : (A) Nuclear isomers have same atomic number and same mass number but with different radioactive properties. `U_((A))` and `U_((Z))` are nuclear isomer

Last Answer : (A) Nuclear isomers have same atomic number and same mass number but with different radioactive properties. `U_ ... both (A) and (R ) are incorrect.

A nuclide has mass number (A) and atomic number (Z). During a radioactive process if: (A) both A and Z decrease, the process is called `alpha`-decay (

Description : A nuclide has mass number (A) and atomic number (Z). During a radioactive process if: (A) both A and Z decrease, the process is called `alpha`-decay (

Last Answer : A nuclide has mass number (A) and atomic number (Z). During a radioactive process if: (A) both A and Z decrease, ... 4 C. 1,3, and 4 D. 1,2, and 4

The radioactive nuclide `._(90)^(234) Th` shows two successive `beta-` decay followed by one `alpha-` decay. The atomic number and mass number respect

Description : The radioactive nuclide `._(90)^(234) Th` shows two successive `beta-` decay followed by one `alpha-` decay. The atomic number and mass number respect

Last Answer : The radioactive nuclide `._(90)^(234) Th` shows two successive `beta-` decay followed by one `alpha-` ... is: A. 92234 B. 94230 C. 90230 D. 92230

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

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

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What is the atomic number of an atom with mass number 9 and 5 electrons?

Description : What is the atomic number of an atom with mass number 9 and 5 electrons?

Last Answer : The atomic number is the number of ProtonsThe mass number is the number of Protons and NeutronsThe number of Electrons always equals the number of ProtonsTherefore according to the above information the atomic ... an Atomic number of4Boron has an Atomic mass of 10.811 and an Atomic number of 5

Why is the atomic mass of an element is usually not given as a whole number even though each individual atom of the element has a whole number of protons and neutrons.?

Description : Why is the atomic mass of an element is usually not given as a whole number even though each individual atom of the element has a whole number of protons and neutrons.?

Last Answer : It's the electrons that throw it off.

If an atom has a mass number of 15 and an atomic number of 7 how many neutrons does it have?

Description : If an atom has a mass number of 15 and an atomic number of 7 how many neutrons does it have?

Last Answer : What is the answer ?

How Are the atomic and mass number Affected by positron emission?

Description : How Are the atomic and mass number Affected by positron emission?

Last Answer : What is the answer ?

How many neutrons does element x have if its atomic number is 22 and its mass number is 84?

Description : How many neutrons does element x have if its atomic number is 22 and its mass number is 84?

Last Answer : Need answer

If an atomic number of an element is 6 and its mass is 14 how many neutrons are contained in the nucleus?

Description : If an atomic number of an element is 6 and its mass is 14 how many neutrons are contained in the nucleus?

Last Answer : jjjj

Atomic mass is an atoms number of what?

Description : Atomic mass is an atoms number of what?

Last Answer : it depends because isotopes have different nucleon numbers but their atomic number stays the same.

The atomic number of uranium is 92 and its atomic mass is 238.how many neutrons does the most common isotope of uranium have.?

Description : The atomic number of uranium is 92 and its atomic mass is 238.how many neutrons does the most common isotope of uranium have.?

Last Answer : The most common isotope of uranium is uranium-238 with 146 neutrons.

How many electrons are present in an atom of mercury who is atomic number is 80 and whose mass number is 201?

Description : How many electrons are present in an atom of mercury who is atomic number is 80 and whose mass number is 201?

Last Answer : 121 neutrons.

How is atomic mass number determined?

Description : How is atomic mass number determined?

Last Answer : By adding number of protons and neutrons

The correct statement is (a) Two Isotones always have the same atomic number (b) Two isotopes always have the same mass number (c) Two isobars always have the same atomic number (d) Two isobars always have the same mass number

Description : The correct statement is (a) Two Isotones always have the same atomic number (b) Two isotopes always have the same mass number (c) Two isobars always have the same atomic number (d) Two isobars always have the same mass number

Last Answer : Ans:(d)

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

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)

Which one of the following is the most characteristic property of an element? (a) Density (b) Boiling point (c) Mass number (d) Atomic number

Description : Which one of the following is the most characteristic property of an element? (a) Density (b) Boiling point (c) Mass number (d) Atomic number

Last Answer : Ans:(d)

The mass number of a nucleus is (a) Always less than its atomic number (b) The sum of the number of protons and neutrons present in the nucleus (c) Always more than the atomic weight (d) A fraction

Description : The mass number of a nucleus is (a) Always less than its atomic number (b) The sum of the number of protons and neutrons present in the nucleus (c) Always more than the atomic weight (d) A fraction

Last Answer : Ans:(b)

The mass number of a nucleus is - (1) always less than its atomic number (2) the sum of the number of protons and neutrons present in the nucleus (3) always more than the atomic weight (4) a fraction

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Last Answer : (2) the sum of the number of protons and neutrons present in the nucleus

An atom of an element with mass number 23 and atomic number 11 will have- (1) 11 neutrons, 12 protons and 11 electrons (2) 11 protons, 12 neutrons and 11 electrons (3) 11 protons, 12 electrons and 11 neutrons (4) 23 protons and 11 electrons

Description : An atom of an element with mass number 23 and atomic number 11 will have- (1) 11 neutrons, 12 protons and 11 electrons (2) 11 protons, 12 neutrons and 11 electrons (3) 11 protons, 12 electrons and 11 neutrons (4) 23 protons and 11 electrons

Last Answer : (2) 11 protons, 12 neutrons and 11 electrons

What are isobars? (1) Elements with same atomic number but different mass number (2) Elements with different atomic number but same mass number (3) Elements with different atomic number and different mass number (4) Elements with same atomic number and same mass number

Description : What are isobars? (1) Elements with same atomic number but different mass number (2) Elements with different atomic number but same mass number (3) Elements with different atomic number and different mass number (4) Elements with same atomic number and same mass number

Last Answer : (2) Elements with different atomic number but same mass number Explanation: Isobars are atoms of different chemical elements that have the same number of n cleons. Correspondingly, isobars differ in atomic number (number of protons) but have the same mass number.

All isotopes of the same element have (1) different atomic numbers and different atomic mass (2) different atomic numbers and the same atomic mass (3) the same atomic number but different atomic masses (4) the same atomic number and the atomic mass

Description : All isotopes of the same element have (1) different atomic numbers and different atomic mass (2) different atomic numbers and the same atomic mass (3) the same atomic number but different atomic masses (4) the same atomic number and the atomic mass

Last Answer : (3) the same atomic number but different atomic masses Explanation: Isotopes are forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei. So they have the same atomic number, but differ in relative atomic mass.

The mass number of a nucleus is – (1) always less than its atomic number (2) always more than its atomic number (3) always equal to its atomic number (4) sometimes more - and somtimes equal to its atomic number

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Last Answer : (4) sometimes more - and somtimes equal to its atomic number Explanation: Mass number = protons or mass of electron (atomic number) + neutrons. So it is mostly greater than the atomic number. At best, it can be equal to the atomic number.

An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is– (1) 17 (2) 19 (3) 36 (4) 53

Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is– (1) 17 (2) 19 (3) 36 (4) 53

Last Answer : (2) 19 Explanation: Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19

What is the number of atoms constituting a molecule known as - (1) Atomic number (2) Isotopes (3) Atomic mass (4) Atomicity

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Last Answer : (4) Atomicity Explanation: Atomicity is the total number of atoms present in one molecule of an element.

The umber of neutrons present in an element having mass number 226 and atomic number 88 is– (1) 88 (2) 138 (3) 314 (4) 50

Description : The umber of neutrons present in an element having mass number 226 and atomic number 88 is– (1) 88 (2) 138 (3) 314 (4) 50

Last Answer : (2) 138 Explanation: The mass number is a count of the number of particles in an atom's nucleus which is made up of protons and neutrons. In other words, Mass Number = Number of Protons + Number of Neutrons. ... of an element, 226 = 88 + number of Neutrons. So, the number of neutrons= 226 - 88= 138.

Atomic mass of Sulphur is 32u. The number of moles in 16 games of Sulphur is: (1) 1 mole of Sulphur (2) 0.5 moles of Sulphur (3) 0.75 moles of Sulphur (4) 0.25 moles of Sulphur

Description : Atomic mass of Sulphur is 32u. The number of moles in 16 games of Sulphur is: (1) 1 mole of Sulphur (2) 0.5 moles of Sulphur (3) 0.75 moles of Sulphur (4) 0.25 moles of Sulphur

Last Answer : (2) 0.5 moles of Sulphur Explanation: The molar mass of a com pound is equal to the sum of the atomic masses of its con stituent atoms in g/mol.

An Element Atomic number 17 and mass number 36, then number of neutrons present in it–

Description : An Element Atomic number 17 and mass number 36, then number of neutrons present in it–

Last Answer : 19

What is the number of electrons in an atom of atomic number Z and mass number A?

Description : What is the number of electrons in an atom of atomic number Z and mass number A?

Last Answer : Z

The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is (A) 1 (B) 0.5 (C) 2 (D) 4

Description : The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is (A) 1 (B) 0.5 (C) 2 (D) 4

Last Answer : (A) 1

When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as (A) Isomers (B) Isotopes (C) Isobars (D) Isotones

Description : When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as (A) Isomers (B) Isotopes (C) Isobars (D) Isotones

Last Answer : (D) Isotones

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

In nuclear reactions, __________ number is conserved. (A) Mass (B) Atomic (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : In nuclear reactions, __________ number is conserved. (A) Mass (B) Atomic (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Elements having same mass number and different atomic number are known as?

Description : Elements having same mass number and different atomic number are known as?

Last Answer : Isobars Eg: calcium — 40; Argon - 40

Atoms of the same element having same atomic number and different mass number are known as?

Description : Atoms of the same element having same atomic number and different mass number are known as?

Last Answer : Isotopes

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?

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.

The sum of the mass numbers of the atoms in a molecule equals the ______, which is measured in units called _______. a. Atomic Number; Milligrams b. Mass Weight; Micrograms c. Chemical Weight; Moles d. Molecular Weight; Daltons

Description : The sum of the mass numbers of the atoms in a molecule equals the ______, which is measured in units called _______. a. Atomic Number; Milligrams b. Mass Weight; Micrograms c. Chemical Weight; Moles d. Molecular Weight; Daltons

Last Answer : d. Molecular Weight; Daltons

An Element Atomic number 17 and mass number 36, then number of neutrons present in it

Description : An Element Atomic number 17 and mass number 36, then number of neutrons present in it

Last Answer : 19

The gas constant of a certain gas is the ratio of:  A. Universal gas constant to molar mass  B. Universal gas constant to atomic weight  C. Universal gas constant to atomic number  D. Universal gas constant to number of moles

Description : The gas constant of a certain gas is the ratio of:  A. Universal gas constant to molar mass  B. Universal gas constant to atomic weight  C. Universal gas constant to atomic number  D. Universal gas constant to number of moles

Last Answer : Universal gas constant to molar mass

1. What is the number of electrons in an atom of atomic number Z and mass number A? 2. With which of the following fields is M. F. Hussain associated? 3. Which is the ‘Slack Season’ in the Indian Economy? 4. In which country is Marino sheep rearing the predominant pastoral activity? 5. Which was the lowest unit of Chola administration?

Description : 1. What is the number of electrons in an atom of atomic number Z and mass number A? 2. With which of the following fields is M. F. Hussain associated? 3. Which is the Slack Season' in ... 19. What are Shield volcanoes? 20. Mughal dynasty was to Bahadur Shah Zafar-as what was Lodi dynasty to?

Last Answer : Answer : 1. Z 2. Painting 3. Jan.-June 4. Australia 5. Valanadu 6. Stomata 7. 9th December, 1946 8. Measuring flask 9. China 10. Rajaraja Chola I 11. Vocal music 12. Abidjan 13. ... N. Rao 17. By radiation only 18. Useful but need strict regulation 19. Repeated lava flows 20. Ibrahim Lodi

All isotopes of the same element have ______ (1) different atomic numbers and different atomic mass (2) different atomic numbers and the same atomic mass (3) the same atomic number but different atomic masses (4) the same atomic number and the atomic mass

Description : All isotopes of the same element have ______ (1) different atomic numbers and different atomic mass (2) different atomic numbers and the same atomic mass (3) the same atomic number but different atomic masses (4) the same atomic number and the atomic mass

Last Answer :  the same atomic number but different atomic masses

The mass number of a nucleus is (1) always less than its atomic number (2) always more than its atomic number (3) always equal to its atomic number (4) sometimes more and somtimes equal to its atomic number

Description : The mass number of a nucleus is (1) always less than its atomic number (2) always more than its atomic number (3) always equal to its atomic number (4) sometimes more and somtimes equal to its atomic number

Last Answer : sometimes more and somtimes equal to its atomic number

An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is (1) 17 (2) 19 (3) 36 (4) 53

Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is (1) 17 (2) 19 (3) 36 (4) 53

Last Answer : 19

The number of neutrons present in an element having mass number 226 and atomic number 88 is : (1) 88 (2) 138 (3) 314 (4) 50

Description : The number of neutrons present in an element having mass number 226 and atomic number 88 is : (1) 88 (2) 138 (3) 314 (4) 50

Last Answer : 138

The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ? (1) 6 (2) 12 (3) 18 (4) Zero

Description : The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ? (1) 6 (2) 12 (3) 18 (4) Zero

Last Answer : 6 

Define : i) Atomic number ii) Atomic mass number iii) Energy level iv) Sub energy level

Description : Define : i) Atomic number ii) Atomic mass number iii) Energy level iv) Sub energy level

Last Answer : i) Atomic number: It is defined as; the number of protons present in the nucleus, which exactly balances the number of electrons present in the extra nuclear part. ii) Atomic mass number: It ... : The close grouping of number of energy levels in the main energy level is called sub energy level.