Answer
b) lithium
Work Step by Step
Right subscript to the symbol is neutron number(N) and left superscript is the mass number(A).
We know that,
Atomic number(Z)= A-N= 7-4=3
The element with the atomic number equal to 3 is lithium.
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 29 - The Nucleus - Learning Path Questions and Exercises - Multiple Choice Questions - Page 995: 5
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