Question

Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9. Which group does X belong in? Choose one of the following and explain the answer.

a) I b) III c) VII d) 0

Answer 1

C the is no other explanation but that trust me

Answer 2

C

Step-by-step explanation:

Flourine has

9 protons

9 electrons

10 neutrons

this makes the atomic number 9 and the atomic weight 19.

hope it helps