11 terms

Periodic Table

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Magnesium
Mg 12
Aluminum
Al 13
Silicon
Si 14
Phosphorus
P 15
Sulfur
S 16
Chlorine
Cl 17
Argon
Ar 18
Potassium
K 19
Calcium
Ca 20
Scandium
Sc 21
Chromium
Cr 24