Answer:
Ionic compounds contain ions and are held together by the attractive forces among the oppositely charged ions
Explanation:
Common salt (sodium chloride) is one of the best-known ionic compounds. Molecular compounds contain discrete molecules, which are held together by sharing electrons (covalent bonding).
The wall would absorb extra heat during the day when the sun is out, then release the heat back into the room when the sun goes down.
It could not hold good for elements heaver than calcium.
