Isoneutronic group , आइसोन्यूट्रोनिक ग्रुप , isotones

The isoneutronic group, in the following, is:

निम्नलिखित में आइसोन्यूट्रोनिक ग्रुप, है:
□ 6C12, 7N14, 8O16
□ 6C12, 7N14, 8O18
□ 6C14, 7N14, 8O16
□ 6C14, 7N15, 8O16

Correct Option : 6C14, 7N15, 8O16

Two nuclides are isoneutronic (isotones) if they have the very same neutron number  

As per the question

6C14 = 14 – 6 = 8 neutron

7C15 = 15–7 = 8 neutron

8C16 = 16 – 8 = neutron

Since the number of neutrons in all is 8 they are all Isotones.

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