Question

The electronic configuration of an element X is 2, 8, 8, 2.

1. What is the atomic number of element X?
2. To which group does this element belong?
3. In which period does this element lie?

Answer 1

1. Element 'X' has the electrical configuration 2, 8, 8, 2. This indicates that X's atomic number is (2 + 8 + 8 + 2), which equals 20.
2. It belongs to 2^nd group because it has 2 valence electrons.
3. It belongs to 4^th period because it has four energy shells.