Which element has the same number of valence electrons as bromine (Br)?
(1 point)
Responses
selenium (Se)
selenium (Se)
chlorine (Cl)
chlorine (Cl)
potassium (K)
potassium (K)
krypton (Kr)
3 answers
chlorine (Cl)
Why are sodium (Na) and potassium (K) in the same group on the periodic table?(1 point)
Responses
They have similar reactivity.
They have similar reactivity.
They have similar atomic weights.
They have similar atomic weights.
They are both hard and brittle.
They are both hard and brittle.
They are both colorless.
Responses
They have similar reactivity.
They have similar reactivity.
They have similar atomic weights.
They have similar atomic weights.
They are both hard and brittle.
They are both hard and brittle.
They are both colorless.
They have similar reactivity.