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2.Hel - K2 i 2e.w.
3.Lit - K2L1 1e.w.
4.Beryl - K2L2 2e.w.
5.Bor - K2L3 3e.w.
6.Węgiel - K2L4 4e.w.
7.Azot - K2L5 5e.w.
8.Tlen - K2L6 6e.w.
9.Fluor - K2L7 7e.w.
10.Neon - K2L8 8e.w.
11.Sód - K2L8M1 1e.w.
12.Magnez - K2L8M2 2e.w.
13.Glin - K2L8M3 3e.w.
14.Krzem - K2L8M4 4e.w.
15.Fosfor - K2L8M5 5 e.w.