Nitrates of all the metals are

Sodium metal cannot be stored under

Select the correct statement for alkali metal ions:-

Fill in the blanks:
$(1)$ ......... method is used to prepare sodium carbonate.
$(2)$ Sodium carbonate exists as .........
$(3)$ Sodium chloride is commonly known as .........
$(4)$ Sodium chloride melts at ......... temperature.

The electronic configuration of a metal is $1s^2 2s^2 2p^6 3s^1$. The formula of its oxide is:

When sodium is heated with moist air,the product obtained is: