Level 1
Level 3
18 words 0 ignored
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C
Carbon
Br
Bromine
Na
Sodium
K
Potassium
Kr
Krypton
O
Oxygen
N
Nitrogen
Ne
Neon
Al
Aluminium
Fe
Iron
Cu
Copper
Zn
Zinc
Si
Silicon
S
Sulfur
Ca
Calcium
Li
Lithium
Cl
Chlorine
I
Iodine
