Which of the following elements belongs to group $2$ and sixth period of the periodic table?

Choose the correct statement from the following:
$(i)$ Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
$(ii)$ $BeO$ is an amphoteric oxide.
$(iii)$ Beryllium exhibits coordination number more than four.
$(iv)$ Beryllium oxide is purely acidic in nature.

Mortar is a mixture of

Which of the following on thermal decomposition gives both basic and acidic oxides?

Magnesium powder burns in air to give

Portland cement is manufactured using which of the following?