Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Periodic Table

Which pair of atomic number represents s block elements:

1

19, 56

2

22, 55

3

12, 15

4

More than one of the above

5

None of the above

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