1.
Both elements of 1st period contain valence electrons in

2.
In the periodic table, helium is placed at

3.
Across the period the atomic size decreases due to

4.
The first three periods are

5.
On basis of electronic configuration the group and period of ⁹₅B is

6.
Chemical properties depend upon

7.
Nobel gases are present in

8.
The energy required to remove an electron from the outermost shell is called

9.
As we go from top to bottom in a group the shielding effect

10.
Group A elements are called

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