Question

Is there a way to memorize electron pair configuration shells? x_x

Answer 1

so far I've been doing this
1, 2 [s, s]
2, 3 [d, s]

(example. I have to re-research to get it right)

Answer 2

are you talking about quantum numbers?

Answer 3

yeah

Answer 4

This is the graph that I used to learn it. There is no real tricks that I know of.

Answer 5

I think.

okay it's
1, 2 [s, s]
2, 3 [p, s]
3, 4 [p, s]
3, 4, 5 [d, p, s]
4, 5, 6 [d, p, s]
4, 5, 6, 7 [f, d, p, s]
5, 6, 7 [f, d, p]
6, 7 [f, d]
7 [f]

Answer 6

Pain to memorize but easier than the original.
I say worth it

Answer 7

Thats actually a good way to look at that.

Answer 8

YAY xD

Answer 9

Ignore the thing i put its for something different >.<.

Answer 10

Oh okay lol

Answer 11

Any tips for electronegativity, polarity, atomic size?

Answer 12

Or just memorize the trends?

Answer 13

Basically EN increases going from left to right and from bottom to top. Helps to remember that Elements on the farthest right side of the periodic table have more valence electrons and tend to generally want to gain electrons. (EN=is a measure of the tendency of an atom to attract a bonding pair of electrons).

Answer 14

Okay... and polarity?

Answer 15

Polarity in terms of molecular shape?

Answer 16

wait wot

Answer 17

Like say you have CH4. It has a tetrahedral geometrical shape. Although there is an Electronegativity difference between the Carbon and Hydrogen atom this EN difference is evenly distributed around the molecule so CH4 has 0 polarity.

Answer 18

*Polarity is EN diff and applies only to compounds?

Answer 19

Yea exactly. It does technically apply to molecules.

Answer 20

Oh? o:

Answer 21

Say CO2 is a molecule which has an EN difference between the Carbon and the oxygen.

Answer 22

Although CO2 is still nonpolar because the polarity is evenly distributed like this.

Answer 23

sorry for bad drawing :/

Answer 24

An example of a molecule that is affected by polarity is H2O.

Answer 25

here the polarity is not evenly distributed so the H2O molecule is polar with positive Hydrogen ends and a negative oxygen end.

Answer 26

Your drawings are gr8 ok

Answer 27

The point is that they help

Answer 28

lol too kind :).
But yea in terms of polarity not considering molecular shape its purely the difference in EN between 2 atoms.

Answer 29

what does molecular shape do?

Answer 30

Like NaCl. EN differnce is large between the Na and Cl.
For CH4. The EN difference is not very large between the C and H.

Answer 31

It just affects whether the a molecule which has EN differences between the central atom will be polar or not.

Answer 32

CO2 is the good example. C and O have an EN difference but they are evenly distributed around the central atom so the CO2 molecules becomes non-polar.

Answer 33

oh

so most likely polarity will be addressed in terms of compounds then?

Answer 34

probably. I wasn't sure if you were referring to polarity with molecular shape. But it will most likely be addressed in terms of compounds.

Answer 35

alright

Answer 36

atomic size trend?

Answer 37

I have EN down by heart whew

Answer 38

Good to hear!.
Now for atomic size. Atomic size decreases as you go left to right on the periodic table. Atomic size increases as you go from top to bottom of the periodic table.

Answer 39

so... backwards EN

Answer 40

Just to help myself x_x

Answer 41

Uh yea you could think about it like that lol

Answer 42

YAH >:D

Answer 43

# of valence electrons = add up atomic #s of respective molecules?

Answer 44

Give me an example of what your talking about. I'm not quite sure i follow.

Answer 45

# of val e- for SO\(_{4}^{2-}\)

Answer 46

Oh ok gotcha