Question

If an atom of lithium has 3 protons, 3 electrons, and 4 neutrons then what is its atomic mass number?
A. 3
B. 4
C. 7
D. 10

Answer 1

Protons+Neutrons=Mass number

Answer 2

You are probably giving me that "stare" I keep forgetting you said this. Sorry

Answer 3

It's alright just solve it :)

Answer 4

Thank you. it's 7

Answer 5

Well done ^_^