Electron configurations (1)

Energy levels and sub-levelsEnergy levels and sub-levels

A

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Energy levels

• These are broadly similar to the “shells” used in GCSE Chemistry

• You need to know about energy levels 1, 2, 3 and 4 at A Level

Energy level 1 is lowest in energy and closest to the nucleus


Sub-levels

• The main energy levels contain sub-levels

• The different main energy levels have different sub-levels in them

There are four types: s, p, d, f


Main energy level

Sub-levelsMax. no. of

electron pairs in sub-level

Max. no. of electrons in

sub-level

Max. no. of electrons in main level


Main energy level




sub-level


1


Main energy level




sub-level


1 s


Main energy level




sub-level


1 s 1


Main energy level




sub-level


1 s 1 2


Main energy level




sub-level


1 s 1 2 2


Main energy level




sub-level


1 s 1 2 2

2


Main energy level




sub-level


1 s 1 2 2

2s 1 2


Main energy level




sub-level


1 s 1 2 2

2s 1 2

p


Main energy level




sub-level


1 s 1 2 2

2s 1 2

p 3


Main energy level




sub-level


1 s 1 2 2

2s 1 2

p 3 6


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

p 3 6


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

p 3 6

d


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

p 3 6

d 5


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

p 3 6

d 5 10


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

18p 3 6

d 5 10


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

18p 3 6

d 5 10

4


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

18p 3 6

d 5 10

4

s 1 2

p 3 6

d 5 10


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

18p 3 6

d 5 10

4

s 1 2

p 3 6

d 5 10

f


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

18p 3 6

d 5 10

4

s 1 2

p 3 6

d 5 10

f 7


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

18p 3 6

d 5 10

4

s 1 2

p 3 6

d 5 10

f 7 14


Main energy level




sub-level


1 s 1 2 2

2s 1 2

8p 3 6

3

s 1 2

18p 3 6

d 5 10

4

s 1 2

32p 3 6

d 5 10

f 7 14

Electron configurations (1)

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