Why are sodium (Na) and potassium (K) in the same group on the periodic table?%0D%0A%0D%0A%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0AThey are both colorless. %0D%0AThey are both colorless. %0D%0A%0D%0AThey have similar reactivity. %0D%0AThey have similar reactivity. %0D%0A%0D%0AThey are both hard and brittle. %0D%0AThey are both hard and brittle. %0D%0A%0D%0AThey have similar atomic weights.

Answer 1

Sodium (Na) and potassium (K) are in the same group on the periodic table because they have similar reactivity. This similarity in reactivity is due to their having the same number of valence electrons, which is characteristic of elements in the same group. Specifically, they both belong to Group 1, known as the alkali metals, and they exhibit similar chemical properties, including how they react with water and other substances.