Question

PLEASE HELP WILL MEDAL
How is the number of neutrons in the nucleus of an atom calculated?
A)Add the number of electrons and protons together
B) Subtract the number of electrons from the number of protons
C) Subtract the number of protons from the mass number
D) Add the mass number to the number of electrons

Answer 1

C) Subtract the number of protons from the mass number.
The mass number is defined as the number of protons plus the number of neutrons in the nucleus, so some algebra tells us that the number of neutrons is the mass number minus the number of protons.

Answer 2

You're correct! Thank you so much

Answer 3

Aww, it was nothing. :) If only they asked stuff like that in AP Chem...