NH₃ < PH₃ < AsH₃ $$-$$ acidic

Li < Be < B < C $$-$$ 1^st IP

Al₂O₃ < MgO < Na₂O < K₂O $$-$$ basic

Li⁺ < Na⁺ < K⁺ < Cs⁺ $$-$$ ionic radius.

$$\left( {n - 2} \right){f^{1 - 14}}\,\left( {n - 1} \right){s^2}{p^6}{d^{0 - 1}}\,n{s^2}$$

$$\left( {n - 2} \right){f^{0 - 14}}\,\left( {n - 1} \right){d^{0 - 1}}\,n{s^2}$$

$$\left( {n - 2} \right){f^{0 - 14}}\,\left( {n - 1} \right){d^{10}}\,n{s^2}$$

$$\left( {n - 2} \right){d^{0 - 1}}\left( {n - 1} \right)\,{f^{1 - 14}}\,n{s^2}$$

Cr

Fe

Mn

V

Zn act as oxidising agent when react with HNO₃

HNO₃ is weaker acid than H₂SO₄ and HCl

In electrochemical series Zn is above hydrogen

NO$$_3^ - $$ is reduced in preference to hydronium ion.