A: Atoms with the same mass number but differ | vedclass

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(C) Isobars are defined as atoms of different elements having the same mass number $(A)$ but different atomic numbers $(Z)$.Therefore,statement $A$ is

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$A$ is true,but $R$ is false.

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(C) Isobars are defined as atoms of different elements having the same mass number $(A)$ but different atomic numbers $(Z)$.Therefore,statement $A$ is true.By definition,the mass number $(A)$ is the sum of the number of protons $(Z)$ and the number of neutrons $(N)$,i.e.,$A = Z + N$.Since isobars have the same mass number $(A)$,the sum of protons and neutrons is constant for them,not different.Therefore,statement $R$ is false.

$A$: Atoms with the same mass number but different atomic numbers are called isobars.
$R$: In isobars,the sum of protons and neutrons is always different.

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$A$: Atoms with the same mass number but different atomic numbers are called isobars.$R$: In isobars,the sum of protons and neutrons is always different.