Question

Two atoms are said to be isobars if.

Options

• they have same atomic number but different mass number.

• they have same number of electrons but different number of neutrons.

• they have same number of neutrons but different number of electrons.

• sum of the number of protons and neutrons is same but the number of protons is different.

Answer 1

sum of the number of protons and neutrons is same but the number of protons is different.

Explanation:

Isobars are the atoms which have same mass number (sum of number of neutrons and protons) but different atomic number (i.e. different proton number)

For example, 6₁₄C and 7₁₄N.