The reactivity of the following compounds toward water is in the order:

If an electron is transferred from $B$ to $A$,then the reaction is possible when:

Three elements $X$,$Y$ and $Z$ are in the $3^{rd}$ period of the periodic table. The oxides of $X$,$Y$ and $Z$,respectively,are basic,amphoteric and acidic. The correct order of the atomic numbers of $X$,$Y$ and $Z$ is:

Explain the trends in physical and chemical reactivity of elements across a period and down a group.

Aluminium is diagonally related to (in periodic table)

Use the periodic table to answer the following questions.
$(a)$ Identify an element with five electrons in the outer subshell.
$(b)$ Identify an element that would tend to lose two electrons.
$(c)$ Identify an element that would tend to gain two electrons.
$(d)$ Identify the group having metal,non-metal,liquid as well as gas at room temperature.