Question

how many neutrons would fluorine have? its atomic number is 9. its atomic mass is 19. 1 point
4
10
23
26
29
81

Explanation:

Step1: Recall the relationship

The atomic mass is the sum of protons and neutrons, and the atomic number is equal to the number of protons. Let the number of neutrons be $n$, number of protons be $p$, and atomic mass be $A$. So $A=p + n$.

Step2: Identify the number of protons

Given the atomic number of fluorine is 9, so the number of protons $p = 9$.

Step3: Calculate the number of neutrons

We know $A = 19$ and $p=9$. Substitute into the formula $n=A - p$. Then $n=19 - 9=10$.

Answer:

10