The atomic number of an element ‘X’ is 19. Write its electronic configuration

[Murali]

The atomic number of an element ‘X’ is 19.

1. Write its electronic configuration.
2. To which period of the Modern Periodic Table does it belong and what is its valency?
3. If ‘X’ burns in oxygen to form its oxide, what will be its nature - acidic, basic or neutral?
4. Write balanced chemical equation for the reaction when this oxide is dissolved in water.

Answer:

1. Configuration of X (19) = 2,8,8,1.
2. It belongs to fourth period and its valency is 1.
3. Basic oxide (X20)
4.