Question

Potassium and nickel are in the same row of the periodic table. What do these elements have in common?(1 point)
Responses

They have similar reactivity.
They have similar reactivity.

They have the same number of valence electrons.
They have the same number of valence electrons.

They have similar physical properties.
They have similar physical properties.

They have the same number of electron shells.

Answer 1

Potassium and nickel are not in the same row (period) of the periodic table; potassium (K) is in period 4, while nickel (Ni) is in period 4. Therefore, they do share the same number of electron shells, as both are in period 4.

The correct response is:

**They have the same number of electron shells.**