Li⁺ > Be²⁺ > Na⁺ > Mg²⁺

Na⁺ > Li⁺ > Mg²⁺ > Be²⁺

Li²⁺ > Na⁺ > Mg²⁺ > Be²⁺

Mg²⁺ > Be²⁺ > Li⁺ > Na⁺

the properties of the elements are the periodic function of their atomic number

non-metallic elements are lesser in number than metallic elements

the first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number

for transition elements, the d-subshells are filled with electrons monotonically with increase in atomic numbers

Mg <Al< Na⁺ < F ^-

Na⁺ < Al < Mg < F ^-

Na⁺ < F ^- < Al < Mg

Na⁺ < F ^-  < Mg < Al

K⁺

Rb⁺

Li⁺

Na⁺

their sizes are same

Cl^- ion is bigger than K⁺ ion

K⁺ ion is relatively bigger

their sizes depend on other cation and anion

Al³⁺ > Mg²⁺ > Na⁺ > F ^- > O^2-

Na⁺ > Mg²⁺ > Al³⁺ > O^2- > F ^-

Na⁺ > F ^- > Mg²⁺ > O^2- > Al³⁺

O^2- > F ^- > Na⁺ > Mg²⁺ > Al³⁺

F < S < P < B

P < S < B < F

B < P < S < F

B < S < P < F

1s²

1s²,2s² 2p²

1s²,2s² 2p⁶

1s²,2s² 2p⁶,3s¹

Mg²⁺ < Be²⁺ < K⁺ < Ca²⁺

Be²⁺ < K⁺ < Ca²⁺ < Mg²⁺

K⁺ < Ca²⁺ < Mg²⁺ < Be²⁺

Ca²⁺ < Mg²⁺ < Be²⁺ < K⁺

N^3-

O^2-

F ^-

Na⁺