an isotope of the element fluorine has 9 protons and 10 neutrons. what is the name of this isotope? fluorine-

an isotope of the element fluorine has 9 protons and 10 neutrons. what is the name of this isotope? fluorine-
Answer
Explanation:
Step1: Define mass number
The mass number (A) of an isotope is the sum of the number of protons (p) and neutrons (n). $A=p + n$
Step2: Calculate mass number
Given $p = 9$ and $n=10$. $A=9 + 10=19$
Answer:
19