railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Periodic Table

અણુ સંખ્યાની કઈ જોડી s-બ્લોક તત્વોનું પ્રતિનિધિત્વ કરે છે:

1
7, 19
2
22, 55
3
12, 15
4
19, 56
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