railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Periodic Table

આધુનિક આવર્ત કોષ્ટકમાં તત્વો _______ ઊભી કૉલમમાં ગોઠવાયેલા છે.

1
9
2
12
3
18
4
16
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