Answer:
Step-by-step explanation:
Potassium
Malleable and highly reactive.
It is present in group one.
It has one valance electron.
It lose one electron and readily react with other metals.
Barium
Great conductor of heat and electricity.
Barium is present in group two.
It has two valance electrons.
It is alkaline earth metal.
Boron
C) Has properties of both metals and nonmetals.
Boron in present in group 13.
It is metalloid because it is present in crystalline form like metals and very low conductivity like non metals.
Neon
It is non reactive gas.
It is present in group 18.
Its octet is complete and non reactive noble gas.