Chem 202 Exam 1 Packet 1 with Questions
and Answers
in a lewis structure, what can H have? ANSWER 1 bond, 0 pairs
in a lewis structure, what can C have? ANSWER 4 bonds, 0 pairs
in a lewis structure, what can N have? ANSWER 3 bonds, 1 pair
in a lewis structure, what can O have? ANSWER 2 bonds, 2 pairs
in a lewis structure, what can F, Cl, Br, and I have? ANSWER 1 bond, 3 pairs
what is the 1st exception of the octet rule? ANSWER species having an odd number of
electrons
what is the 2nd exception of the octet rule? ANSWER some compounds of the early 2nd row
elements have a deficiency of electrons (incomplete octet)
what is the 3rd exception of the octet rule? ANSWER more than 8 in octet because of 3d
orbitals being available
what is the formula for FC? ANSWER FC= [# of valence electrons of neutral atom] - [non-
bonded electrons + number of bonds]
generally, what makes a structure better? ANSWER when the formal charge = 0
and Answers
in a lewis structure, what can H have? ANSWER 1 bond, 0 pairs
in a lewis structure, what can C have? ANSWER 4 bonds, 0 pairs
in a lewis structure, what can N have? ANSWER 3 bonds, 1 pair
in a lewis structure, what can O have? ANSWER 2 bonds, 2 pairs
in a lewis structure, what can F, Cl, Br, and I have? ANSWER 1 bond, 3 pairs
what is the 1st exception of the octet rule? ANSWER species having an odd number of
electrons
what is the 2nd exception of the octet rule? ANSWER some compounds of the early 2nd row
elements have a deficiency of electrons (incomplete octet)
what is the 3rd exception of the octet rule? ANSWER more than 8 in octet because of 3d
orbitals being available
what is the formula for FC? ANSWER FC= [# of valence electrons of neutral atom] - [non-
bonded electrons + number of bonds]
generally, what makes a structure better? ANSWER when the formal charge = 0
