Question

why sn4+ salt more stable than sn2+

Answer 1

Because it's last shell is fully filled
Therefore it is stable

Answer 2

$sn^4^+$ salt more stable than $sn^2^+$:

• $Sn^4^+$ is more stable than $Sn^2^+$. This is true because the 'oxidation state' of more than the 'oxidation state' of $Sn^2^+$due to inert pair effect.  

• The $Sn^2 ^+$  ions are transformed to $Sn^4 ^+$ ions as the oxidation state of tin(IV) is stabler than tin(II).

• This means the loss of two more electrons from the tin(II) ions, which must be supplied in some other way.

• Electron benefit reflects a reduction, so that tin (II) ions suppress agents.

• The +4 condition is the most robust for the elements of steel, silicon, and germanium.

• The condition of tin + 4 is stabler than + 2, but compounds of tin(II) are fairly common.

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