Answer:
21
Explanation: its actually 20.85 but i guess they round to 21
Answer:
atoms form bonds by donating, accepting or sharing electrons with other atoms in order to complete their valence shell electrons
hence , C. Bonding gives an atom the same number of protons as a noble gas.
Explanation:
i hope it helped
Tectonic plates is the unscrambled phrase in that jumble.