Isotopes have different mass numbers because their nuclei contain different number of__.

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Solution

Neutrons.

Isotopes are defined as the atoms of the same element, having the same atomic number but different mass numbers.

Since,

mass number = number of protons + number of neutrons

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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Complete the following statements :

(a) Magnesium has 2 valence electrons in the ___ shell.

(b) The valency of nitrogen in $N_{2}$ molecule is ___

(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called ___

(a) Magnesium has 2 valence electrons in the ............. shell.

(b) The valency of nitrogen in N₂ molecule is .............

(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called .............

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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