13. How is a covalently bonded compound, such as O₂, formed?
14. How can an atom become stable or "happy"?
15. Approximately 99.9% of the mass of an atom is in its
16. Compare and contrast ionic and covalent bonds.
17.
12
Mg
25
Atomic number:
Mass number:
# of Protons:
# of Neutrons
# of Electrons:
||
18.
16
S
35
Atomic number:
Mass number:
# of Protons:
# of Neutrons
# of Electrons: