In which of the following,the elements $Al, B, Mg$ and $K$ are correctly arranged in the increasing order of their metallic character?

Explain the periodic properties of elements and their reactivity trends in the 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.

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:

Identify the correct order of basicity for the following oxides: $Na_2O, MgO, CuO, SiO_2$.

Which of the following is the correct order of acidic strength?