electronic configuration and valence electrons Flashcards
1
Q
where do electrons spin around the nucleus
A
in a series of levels called energy shells
2
Q
how many electrons can each shell hold
A
a specific number
first one - 2
second and third - 8
4th - 32
3
Q
hydrogen
A
1
4
Q
helium
A
2
5
Q
lithium
A
2 . 1
6
Q
beryllium
A
2 , 2
7
Q
boron
A
2 , 3
8
Q
carbon
A
2 , 4
9
Q
nitrogen
A
2 , 5
10
Q
oxygen
A
2 , 6
11
Q
fluorine
A
2 , 7
12
Q
neon
A
2 , 8
13
Q
sodium
A
2 , 8 , 1
14
Q
magnesium
A
2 , 8 , 2
15
Q
aluminium
A
2 , 8 , 3
16
Q
silicon
A
2 , 8 , 4
17
Q
phosphorous
A
2 , 8 , 5
18
Q
sulfur
A
2 , 8 , 6
19
Q
chlorine
A
2 , 8 , 7
20
Q
argon
A
2 , 8 , 8
21
Q
potassium
A
2 , 8 , 8 , 1
22
Q
calcium
A
2 , 8 , 8 , 2
23
Q
define valence electrons
A
the number of electrons in outer most energy shell known as valence shell
