August 2018 1 14 Report
Odczytaj zapisy, czyli symbole pierwiastków i wzory związków chemicznych:

BaO,
3 N
2 MgCl₂
3 O₂
5 H₂O
2 SO₂
2 S
P₄
2 H
H₂
4 Pb
3 PbO
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