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# Isotopes have the same atomic number but different atomic mass number.State whether the given statement is true or falseA. TrueB. False

Last updated date: 11th Sep 2024
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Hint: The total number of protons present the atomic nucleus is called its atomic number and mass number is the total number of protons and neutrons present in the atomic nucleus. In isotopes the atomic number is same in the atoms of given element and the number of neutrons may be different

Complete step by step solution:
The atomic mass number speaks about the total number of protons and neutrons present in an atomic nucleus.
Isotopes are defined as the atoms of the same element having same atomic number (same number of protons) but different atomic mass number (different number of neutrons)

Consider the example of Carbon isotopes
$_{\text{6}}{{\text{C}}^{{\text{11}}}}{{\text{,}}_{\text{6}}}{{\text{C}}^{{\text{12}}}}{{\text{,}}_{\text{6}}}{{\text{C}}^{{\text{13}}}}{{\text{,}}_{\text{6}}}{{\text{C}}^{{\text{14}}}}$ Where the total number of protons is same i.e, ${\text{6}}$ and the total number of neutrons are different

Uranium has got two isotopes
$_{{\text{92}}}{{\text{U}}^{{\text{235}}}}{{\text{,}}_{{\text{92}}}}{{\text{U}}^{{\text{238}}}}$ Where ${\text{92}}$ is the total number of protons and the number of neutrons are different i.e.,${\text{235}}$ and ${\text{238}}$

Hydrogen has three stable isotopes i.e, Protium, Deuterium and Tritium
$_{\text{1}}{{\text{H}}^{\text{1}}}{{\text{,}}_{\text{1}}}{{\text{H}}^{\text{2}}}{{\text{,}}_{\text{1}}}{{\text{H}}^{\text{3}}}$

So, the statement is true.