Question

2. Two atoms are said to be isobars if
(i) they have the same atomic number but different mass number.
(ii) they have the same number of electrons but different number of neutrons.
(iii) they have the same number of neutrons but different number of electrons.
(iv) sum of the number of protons and neutrons is same but the number of protons are different.​

Answer 1

Answer:

Isobars:

Isobars are atoms of different elements having different atomic number but the same mass number.

Isobars have different number of protons in the nucleus but the total number of nucleons (protons + neutrons) in them is the same.

E.g

Argon & Calcium are isobars

40Ar18 & 40Ca20

This is because Argon & Calcium are atom of different elements having different atomic number of 18 and 20 respectively but the same mass number of 40.

Isobar protons neutrons mass no.

40Ar18 18 22 18+22= 40

40Ca20 20 20 20+20= 40

Another e.g of Isobars is :

24Na11 & 24Mg12

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Two numbers are said to be isobars if:

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

Hence option (iv) is correct.

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Hope this will help you.....

Explanation: