Ncert Exercises & Solutions

What property identifies two atoms as isobars?

1.	They have the same atomic number but different mass numbers.
2.	They have the same number of electrons but a different number of neutrons.
3.	They have the same number of neutrons but different numbers of electrons.
4.	The sum of the number of protons and neutrons is the same but the number of protons is different.

Hint: Element have same mass number and different atomic number

Isobars have the same mass number (i.e., the sum of protons and neutrons) but a different atomic number (i.e., number of protons). e.g., $Ar_{18}^{40}$

are $K_{19}^{40}$ isobars.

${}_{18}^{40}{Ar}$	${}_{19}^{40}K$
Atomic number=18	Atomic number=19
Mass number=40	Mass number=40

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