November 2018 2 37 Report
Podaj co oznaczaja zapisy:
a) 3

H2O


b) N2 (dolne podkreslenie)
c) K
d) P4 (dolne podkreslenie)
e) 7 Sn
f) 2 O3 ( dolne podkreslenie )

prosze o pomoc. pilne!!!



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