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Sodium
Na (atomic number 11)
Magnesium
Mg (atomic number 12)
Aluminium
Al (atomic number 13)
Silicon
Si (atomic number 14)
Phosphorus
P (atomic number 15)
Sulfur
S (atomic number 16)
Chlorine
Cl (atomic number 17)
Argon
Ar (atomic number 18)
Potassium
K (atomic number 19)
Calcium
Ca (atomic number 20)