ELECTRONIC CONFIGURATION: Arrangement of Electrons into shells for an Atom
s- Electrons always occupy shells that are closest to the Nucleus first
- When a shell becomes full, Electrons will fill the next shell
ELECTRONIC CONFIGURATION OF FIRST 20 ELEMENTS:
ELEMENT
|
NUMBER OF ELECTRONS
|
ELECTRONIC CONFIGURATION
|
HYDROGEN
|
1
|
1
|
HELIUM
|
2
|
2
|
LITHIUM
|
3
|
2 . 1
|
BERYLLIUM
|
4
|
2 . 2
|
BORON
|
5
|
2 . 3
|
CARBON
|
6
|
2 . 4
|
NITROGEN
|
7
|
2 . 5
|
OXYGEN
|
8
|
2 . 6
|
FLUORINE
|
9
|
2 . 7
|
NEON
|
10
|
2 . 8
|
SODIUM
|
11
|
2 . 8 . 1
|
MAGNESIUM
|
12
|
2 . 8 . 2
|
ALUMINIUM
|
13
|
2 . 8 . 3
|
SILICON
|
14
|
2 . 8 . 4
|
PHOSPHORUS
|
15
|
2 . 8 . 5
|
SULFUR
|
16
|
2 . 8 . 6
|
CHLORINE
|
17
|
2 . 8, . 7
|
ARGON
|
18
|
2 . 8 . 8
|
POTASSIUM
|
19
|
2 . 8 . 8 . 1
|
CALCIUM
|
20
|
2 . 8 . 8 . 2
|
Hey, I think its 2,8,8 rather than 2,8,18?
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ReplyDeletethe third shell cannot hold 18 electrons?
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