Question

Why are sodium (Na) and potassium (K) in the same group on the periodic table?(1 point)
Responses

They are both colorless.
They are both colorless.
They have similar reactivity.
They have similar reactivity.
They have similar atomic weights.
They have similar atomic weights.
They are both hard and brittle.

Answer 1

Sodium (Na) and potassium (K) are in the same group on the periodic table because **they have similar reactivity**.