Question

How many neutrons are in an atom of carbon with a mass number of 13?
A. 5
B. 6
C. 7
D. 13

Answer 1

No.of neutrons = mass number - atomic number
= 13-6 =7
° therefore no.of neutrons =7

For you~ Reason behind it:
we know atomic number is nothing but the no.of protons inside nucleus or no.of electrons in the shell.
Nucleus has both proton and neutron. Mass number is nothing but sum of no.of protons and no.of neutrons in the nucleus.


Hope you get ur and ^_^

Answer 2

in carbon

atomic number = 6

mass number = 13

.

.

.

mass = no of protons + no of nuetrons

13 = 6 + n

n = 13-6

n= 7

hope my answer helps you mate