October 2021 1 13 Report
В ка­ко­му ряду эле­мен­ты рас­по­ло­же­ны в по­ряд­ке уве­ли­че­ния ва­лент­но­сти в во­до­род­ном со­еди­не­нии?
1) С-SI-GE

2)F-O-N

3)P-S-CL

4) AS-P-N
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