An element has atomic number 19. Where would you expect this element i

1.	An element has atomic number 19. Where would you expect this element in the periodic table and why?
Answer» The clement with atomic number 19 is in 4th period and first group of the periodic table. Reason : 1. Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶4s or [Ar]4s¹ 2. The differentiating electron enters into 4th shell. Hence it belongs to 4th period. 3. The differentiating electron is in ‘s’ orbital. So it belongs to ‘s’ block. 4. The outermost orbital has only one electron. Hence it belongs to first group.

An element has atomic number 19. Where would you expect this element in the periodic table and why?

Answer»

The clement with atomic number 19 is in 4th period and first group of the periodic table.

Reason :

1. Electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶4s or [Ar]4s¹

2. The differentiating electron enters into 4th shell. Hence it belongs to 4th period.

3. The differentiating electron is in ‘s’ orbital. So it belongs to ‘s’ block.

4. The outermost orbital has only one electron. Hence it belongs to first group.