1. Formation of Covalent Compounds
(molecules)

2. - a combination of different element - can be ionic or covalent
compound
- a combination of different element
- can be ionic or covalent
compounds
covalent
ionic

5. when two NONMETALS come in contact they will share electrons rather than transferring them, ex. O and O

6. covalent bond
forms as a result of sharing of electrons
very strong, stronger than ionic bond
atoms that are covalently bonded form molecules
when two atoms form a covalent bond the sharing of electrons allows each to satisfy the octet rule

7. Lewis Structures of Molecules
shared electrons are shows as a dash
pairs of valence electrons surrounding each atom and not involved in bonding are called lone pairs
Ex. O2

8. ex. I2, N2, CO2, H20

9. The type of bonding a group of atoms experience is dictated by electronegativity:
the measure of an atom's ability to attract the pair of electrons it shares with another atom within a covalent bond

10. increases up and right on periodic table
metals have a lower electronegativity then nonmetals, therefore metals lose electrons and nonmetals gain them

11. atoms of elements with a large electronegativity difference will form IONIC compounds (ex. metal and non-metal, NaCl)
atoms of elements with a small electronegativity difference will form COVALENT compounds (ex. non-metal and non-metal, ex. HCl)

12. - more electronegative goes first
compounds
Covalent
- two non-metals
- sharing of electrons
- more electronegative goes first
- form molecules
Ionic
- metal and nonmetal
- transfer of electrons
- cations and anions
- form formula units