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# please explain clearly in detail

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what is isoneutronic?

Q. Two nuclides A and B are isoneutronic. their mass nos. are 76 and 77 respectively. if the atomic no. of A is 32 , then the atomic no. of B will be?

pls explain in detail what is isoneutronic and nuclides? and what this question means and its answer!

Thanks!

rosala  Aug 2, 2017
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The prefix "iso" indicates "the same as", so  isoneutronic means the same number of neutrons.

The mass number tells you the number of nuclides that comprise the nucleus of an atom. These are protons and neutrons.  The atomic number tells you the number of protons on the nucleus, so:

mass number = number of protons + number of neutrons.

A:   76 = 32 + number of neutrons, so number of neutrons = 76 - 32 → 44

B: Has same number of neutrons as A, so 77 = number of protons + 44

Hence number of protons = 77 - 44 → 33. This is the atomic number of B.

Alan  Aug 3, 2017

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