﻿ An element X has two isotopes. X-15 has 7 protons and 8 neutrons.determine the atomic number and mass Number of the second isotope,which has 10 neutrons in its nucleus - AssignmentGrade.com

# An element X has two isotopes. X-15 has 7 protons and 8 neutrons.determine the atomic number and mass Number of the second isotope,which has 10 neutrons in its nucleus

QUESTION POSTED AT 18/04/2020 - 07:27 PM

### Answered by admin AT 18/04/2020 - 07:27 PM

Atomic Number is 7, because isotopes contain the same number of protons. The mass number is 17, because protons + neutrons = mass number.

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