Question

which element has 19 protons in its nucleus?

a) f

b) k

c) cannot determine from the information provided

Explanation:

The atomic number of an element is equal to the number of protons in its nucleus. Fluorine (F) has an atomic number of 9, meaning it has 9 protons. Potassium (K) has an atomic number of 19, so it has 19 protons in its nucleus.

Answer:

b) K