Isotopes of an element differ in number of neutrons present in the nucleus.

True

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False

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Solution

The correct option is A
True

Isotopes are defined as the atoms of the same element having the same atomic number but different mass numbers. The number of protons in all the atoms of a particular element is same, therefore to have different mass numbers, isotopes contain different number of neutrons.

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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?

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