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Tabelul periodic (11-20)
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Cards (10)
11 sodiu =
Na
12 magneziu =
Mg
13 aluminiu =
Al
14 siliciu =
Si
15 fosfor =
P
16 sulf =
S
17 clor =
Cl
18 argon =
Ar
19 potasiu =
K
20 calciu =
Ca