An element reacts with hydrogen to form a compound $A$,which on treatment with water liberates hydrogen gas. The element can be

Sorel's cement is

Beryllium shows a diagonal relationship with aluminum. Which of the following similarities is incorrect?

Statement $A$: Helium and Beryllium have the same outer electronic configuration of the type $ns^2$.
Reason $R$: Both are chemically inert.

Fill in the blanks:
$(1)$ Calcium and beryllium have flame colors of ...... and ....... respectively.
$(2)$ Quantitative analysis of calcium is carried out by ........
$(3)$ Beryllium powder on combustion burns brightly in air and gives ...... and .......
$(4)$ Beryllium hydroxide on dissolving in alkali gives .......

What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?