Which one of the following statements does apply to atoms which are isotopes of the same element?

The sum of the number of protons and neutrons is the same.

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The sum of the number of electrons and neutrons is the same.

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The number of electrons outside the nucleus is the same.

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The mass numbers are the same.

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Solution

The correct option is C
The number of electrons outside the nucleus is the same.

Isotopes are atoms of the same element having same number of protons/electrons but different number of neutrons.

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Question 07

Two atoms are said to be isobars if ?

(a) They have same atomic number but different mass number

(b) They have same number of electrons but different number of neutrons

(d) Sum of the number of protons and neutrons is same but the number of protons is different

_{Z} X^{A}

(^{16} O,^{17} O,^{18} O)

Consider the following statements:

1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element.

2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.

3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes.

Which of the above statements is incorrectly stated?

(a) same number of neutrons but different number of protons

(b) same number of neutrons but different number of electrons

(d) different number of neutrons but same number of protons

Nuclei with the same number of protons but a different number of neutrons are called isobars

Nuclei with the same number of neutrons but a different atomic number are called isotopes

Nuclei with the same mass number are called isotones

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