# Question 37196

Dec 5, 2016

19 amu

#### Explanation:

The mass number of the normal isotope of Florine is 19 amu.
Florine 9 has 9 positive protons.
To be stable Florine normally has 10 neutrons.

Both protons and neutrons have a mass of 1 amu so

9 + 10 = 19