Question

an atom of the element fluorine can be represented by the bohr model shown below. if the atomic mass of this atom is 19, how many neutrons are in the nucleus? 9 10 19 28

Explanation:

Step1: Recall atomic number of fluorine

Fluorine (F) has an atomic number of 9, which means it has 9 protons.

Step2: Use atomic - mass formula

Atomic mass = number of protons + number of neutrons. Let the number of neutrons be $n$. We know atomic mass = 19 and number of protons = 9. So, $19=9 + n$.

Step3: Solve for number of neutrons

$n=19 - 9$.
$n = 10$.

Answer:

10