4.10-11-12 lewis structures

Question 0

what is the duet rule? and which elements follow it?

Answer 0

2 e-‘s in the 1s valance shell

H and He

Question 1

which e-‘s are included in lewis structures?

Answer 1

only val e-‘s

Question 2

why does He not form bonds?

Answer 2

its valance shell is full

Question 3

what is the octet rule?

Answer 3

atoms need to be surrounded by 8 e-‘s

Question 4

what is the first step in writing a lewis structure?

Answer 4

sum the val e-‘s of all the atoms

Question 5

what is the 2nd step in writing a lewis structure?

Answer 5

use a pair of e-‘s to form bonds between each pair of atoms (one pair of e-‘s for each pair of atoms)

Question 6

what is the 3rd step in writing a lewis structure?

Answer 6

arrange the remaining e-‘s to satisfy the duet or octet rules

Question 7

which elements can exceed the octet rule?

Answer 7

those in pd 3 and beyond (they have access to the D orbitals)

Question 8

which elements often have fewer that 8 e-‘s around them in their compounds?

Answer 8

B

Be

Question 9

if it is necessary to exceed the octet rule, where should the extra e-‘s get placed?

Answer 9

the central atom

Question 10

when is resonance used?

Answer 10

when more than one valid lewis structure can be given for a particular molecule

Question 11

what is the actual structure of a molecule with more than one valid structure?

Answer 11

an average of the resonance structures

Question 12

describe formal charge of an atom

Answer 12

the difference between the # of e-‘s an atom has in its free state and the # of e-‘s assigned to it in the compound (actual - assigned)

Question 13

what type of formal charges do atoms in molecules try to acheive

Answer 13

closest to 0

Question 14

where are negative formal charges expected to reside?

Answer 14

the most electronegative atom