Arrange the following as per instructions given in the brackets.

$\mathrm{Cl}, \mathrm{F}, \mathrm{Br}, \mathrm{I}$ (increasing electron affinity)

Arrange the following as per instructions given in the brackets.

$\mathrm{Cs}, \mathrm{Na}, \mathrm{Li}, \mathrm{K}, \mathrm{Rb}$ (decreasing electronegativity)

Arrange the following as per instructions given in the brackets.

$\mathrm{K}, \mathrm{Pb}, \mathrm{Ca}, \mathrm{Zn}$ (increasing reactivity)

.

Arrange the following as per instructions given in the brackets.

$\mathrm{Li}, \mathrm{K}, \mathrm{Na}, \mathrm{H}$ (decreasing order of their ionisation potential)

Chlorine in the Periodic Table is surrounded by elements with atomic numbers $9, 16, 18 \mathrm{and} 35$.

Which of these have Physical and Chemical properties resembling chlorine?

Chlorine in the Periodic Table is surrounded by elements with atomic numbers $9, 16, 18 \mathrm{and} 35.$

Which is more electronegative than chlorine?

Arrange the following in the order of increasing radii:

${\mathrm{Cl}}^{-}, \mathrm{Cl}.$

Arrange the following in the order of increasing radii:

${\mathrm{Mg}}^{2+}, \mathrm{Mg}, {\mathrm{Mg}}^{+}.$