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Byju's Answer

Standard VII

Chemistry

Mass Number and Representation of Atom

The number of...

Question

The number of nucleons in an atom is called __________________.

mass number

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atomic number

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electronic number

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neutron number

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Solution

The correct option is A
mass number

The number of nucleons(neutrons and protons) in an atom is called mass number.

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Multiple Choice Questions

(a) The outermost shell of an atom is known as

(i) valency

(ii) valence electrons

(iii) nucleus

(iv) valence shell

(b) The number of valence electrons present in magnesium is

(i) two

(ii) three

(iii) four

(iv) five

(i) proton

(ii) neutron

(iii) electron

(iv) nucleon

(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be

(i) 35

(ii) 17

(iii) 18

(iv) 52

(e) The number of electrons in an atom is equal to the number of

(i) protons in a neutral atom

(ii) neutrons in a neutral atom

(iii) nucleons in a neutral atom

(iv) none of the above

(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

(i) mass number

(ii) atomic number

(iii) number of electrons

(iv) all of the above

A neutral atom 'X' has a mass number 12 and atomic number 6. Calculate the number of electrons present in the atom.

Q. The number of neutrons in an atom

X

of atomic number

Z

and mass number

A

Q. The atomic composition of element A is as follows: number of neutrons = x, atomic mass = 12, number of electrons = 6. The atomic composition of B is as follows: number of neutrons = y, atomic mass = 28, number of electrons = number of electrons in A + 8.
The ratio of x to y is:

If Z is the number of protons and A the number of nucleons, then the number of neutrons in an atom is given by

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The number of nucleons in an atom is called __________________.

The correct option is A mass number The number of nucleons(neutrons and protons) in an atom is called mass number.

The correct option is A
mass number

The number of nucleons(neutrons and protons) in an atom is called mass number.