Question

question 7 (1 point) how many electrons are in the element potassium with 20 neutrons? a) 19 b) 20 c) 39 d) 39.10 e) none of the above

Explanation:

Step1: Recall atomic number of potassium

Potassium (K) has an atomic number (Z) of 19. Atomic number is equal to the number of protons (\(p^+\)) in an atom, so \(p^+ = 19\).

Step2: Relate protons and electrons in neutral atom

In a neutral atom, the number of electrons (\(e^-\)) is equal to the number of protons. So \(e^- = p^+ = 19\). The number of neutrons is given as 20, but for neutral atom, electrons depend on protons (atomic number), not neutrons.

Answer:

a) 19