1) 1s22s2 --------------- в) RO
2) 1s22s22p3 ------------- г) R2O5
3) 1s22s22p63s1 ------------ б) R2O
4) 1s22s22p1 ---------------- д) R2O3
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1) 1s22s2 --------------- в) RO
2) 1s22s22p3 ------------- г) R2O5
3) 1s22s22p63s1 ------------ б) R2O
4) 1s22s22p1 ---------------- д) R2O3