Level 2
Level 1

Element numbers


20 words 0 ignored

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Helium
2
Lithium
3
Beryllium
4
Boron
5
Carbon
6
Nitrogen
7
Oxygen
8
Fluorine
9
Neon
10
Sodium
11
Magnesium
12
Aluminium
13
Silicon
14
Phosphorus
15
Sulfur
16
Chlorine
17
Argon
18
Potassium
19
Calcium
20
Hydrogen
1