1.
Ar(C)=12
Ar(Si)=28
Ar(Zn)=65
Ar(He)=4
2.
Al2S3
N2O
Cu2O
NaCl
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Answers & Comments
1.
Ar(C)=12
Ar(Si)=28
Ar(Zn)=65
Ar(He)=4
2.
Al2S3
N2O
Cu2O
NaCl