Question

protons: 9
neutrons: 10
electrons: 9
fluorine (with element symbol f, atomic number 9, and a 0 in a box with up/down arrows)

Explanation:

Step1: Recall Atomic Mass Formula

Atomic mass (A) is the sum of protons (p) and neutrons (n), so \( A = p + n \).

Step2: Identify Values

Protons (\( p \)) = 9, Neutrons (\( n \)) = 10.

Step3: Calculate Atomic Mass

Substitute values: \( A = 9 + 10 = 19 \).

Answer:

19