railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Classification of Elements and Periodicity in Properties

_______ ଏକକ-ପରମାଣୁ ବିଶିଷ୍ଟ ଅଣୁର ଏକ ଉଦାହରଣ।

1
ଆର୍ଗନ
2
ସଲଫର
3
ଫସଫରସ
4
ହାଇଡ୍ରୋଜେନ
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