Question

CHEMISTRY:There are 9 rotons & 11 neutrons. What is the atomic number & atomic mass?

A) The atomic number is 9 & the atomic mass is 19

B) The atomic number is 9 & the atomic mass is 20

C) The atomic number is 11 & the atomic mass is 19

D) The atomic number is 11 & the atomic mass is 20

Answer 1

Hey there!

Atomic number is the number of protons.

Atomic mass is the sum of protons and neutrons.

9 + 11 = 20

Your answer is B) The atomic number is 9 & the atomic mass is 20.

Hope this helps!