Question

Do H, K, Rb, Fr have the same number of valence electrons or the same number of energy levels?

A) Same number of valence electrons

B) Same number of energy levels

C) Different number of valence electrons and energy levels

D) No information provided

Answer 1

H, K, Rb, and Fr have the same number of valence electrons, which is one, as they are all group 1 elements, but they have different numbers of energy levels because they are in different periods.

Step-by-step explanation:

The elements H (hydrogen), K (potassium), Rb (rubidium), and Fr (francium) do not have the same number of energy levels; instead, they each have a different number of energy levels because they are in different periods of the periodic table. However, they all have the same number of valence electrons.

Each of these elements belongs to group 1 of the periodic table and has a single electron in its outermost energy level. Therefore, the correct answer is A) Same number of valence electrons.