zarkam21:

Draw the lewis dot diagram for the following atoms F He S

4 weeks ago
Vocaloid:

any ideas on F? based on its location on the ptable how many valence electrons do you think it has? as a reminder these are neutral atoms, not ions

4 weeks ago
zarkam21:

7

4 weeks ago
Vocaloid:

awesome, so you'd draw 7 electrons (3 pairs of 2, plus 1 leftover)

4 weeks ago
Vocaloid:

thoughts on helium?

4 weeks ago
zarkam21:

2

4 weeks ago
Vocaloid:

good helium is a special case, it only has a 1s orbital so the electrons have to be paired up

4 weeks ago
Vocaloid:

thoughts on sulfur?

4 weeks ago
zarkam21:

6

4 weeks ago
Vocaloid:

good sulfur follows the normal rule for pairing, fill up 4 electrons separately then pair up the last 2

4 weeks ago
Vocaloid:

|dw:1540096403486:dw|

4 weeks ago
zarkam21:

CH4

4 weeks ago
Vocaloid:

any ideas? have you tried adding up all the valance electrons for 1 carbon 4 hydrogens?

4 weeks ago
zarkam21:

|dw:1540096455806:dw|

4 weeks ago
Vocaloid:

perfect

4 weeks ago
zarkam21:

But isn't there dots

4 weeks ago
Vocaloid:

there are no free electrons so there shouldn't be any

4 weeks ago
Vocaloid:

this is a covalent compound so all the bonds involved shared electrons, represented by the lines

4 weeks ago
zarkam21:

Sel2

4 weeks ago
Vocaloid:

thoughts? any attempts to add up the valence electrons?

4 weeks ago
Vocaloid:

well, anyway, selenium has 4 valence e's and each iodine has 7, so 6 + 7 + 7 = 20, divide by 2 to get 10 electron pairs so set up your compound where Se is in the middle, and I is bonded to the left and right, and fill up enough lone pairs so that the whole compound has 10 electron pairs total

4 weeks ago
zarkam21:

|dw:1540102685656:dw|

4 weeks ago
Vocaloid:

that's only five pairs, so you gotta fill up the iodine atoms completely to get 10 total pairs

4 weeks ago
Vocaloid:

10 total pairs = 20 total electrons

4 weeks ago
zarkam21:

|dw:1540102838122:dw|

4 weeks ago
Vocaloid:

almost just one more bond on the first SeI

4 weeks ago
Vocaloid:

also when you make a double bond you have to erase an electron pair

4 weeks ago
Vocaloid:

... wait

4 weeks ago
zarkam21:

but thats still 16 :(

4 weeks ago
Vocaloid:

oh, of course, selenium has an expanded octet so it can actually take more than 8, so put the last electrons on the selenium atom itself

4 weeks ago
Vocaloid:

|dw:1540103171322:dw|

4 weeks ago
zarkam21:

I3^-

4 weeks ago
Vocaloid:

well, each iodine gives 7, so 3*7, then you gotta add 1 because we have a -1 charge, so 22 electrons or 11 pairs

4 weeks ago
Vocaloid:

as a hint this one only has single bonds

4 weeks ago
zarkam21:

|dw:1540103405053:dw|

4 weeks ago
Vocaloid:

yeah that should be it, just two things 1. the pair of electrons on the right side shouldn't be in between the bond, they need to be off to the right side 2. since this is an ion you also need to draw a set of brackets around the whole thing, and write the charge at the top right

4 weeks ago
zarkam21:

|dw:1540103565219:dw|

4 weeks ago
Vocaloid:

|dw:1540103559925:dw|

4 weeks ago
Vocaloid:

yup good

4 weeks ago
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