Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test General Science Chemistry Periodic Table

Which pair of atomic number represents s-block elements:

1

7, 19

2

19, 56

3

12, 15

4

More than one of the above

5

None of the above

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