Question

How many protons, electrons and neutrons in F-?

Answer 1

10 electrons

9 protons

10 neutrons

Step-by-step explanation:

Fluorine has atomic number 9

So F has 9 electrons and 9 protons

F gains one electron to form F-

So F- has 10 electrons and 9 protons

The atomic mass of F is 19

As mass no - atomic no = no of neutrons

so 19 - 9 = 10

So F- has 10 neutrons