railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Classification of Elements and Periodicity in Properties

17 ପରମାଣୁ ସଂଖ୍ୟା ବିଶିଷ୍ଟ ଏକ ଉପାଦାନ ହେଉଛି:

1
ହାଲୋଜେନ୍ ଗ୍ୟାସ୍
2
ଏକ ଟ୍ରାଞ୍ଜିସନ ଧାତୁ
3
ଏକ ବିରଳ ଗ୍ୟାସ୍
4
ଏକ କ୍ଷାର ଧାତୁ
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