An oxide has the following properties. It

I. is a white powder
II. reacts with HCI.
III. reacts with NaOH
IV. is insoluble in water
The oxide is

Which of the following statements about atoms of a metal is correct? They

The atom with the electron configuration
1s\(^{2}\)2s\(^{2}\)2p63s\(^{2}\)3p\(^{6}\)3d\(^{10}\)4s\(^{2}\)4p\(^{4}\) is in

Electropositivity of elements across the periodic table normally

Consider the following table

Which of the substances is a liquid at room temperature and rapidly evaporates on exposure to air?