Why we can't write hg2f2 as hg f

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H g_{2}^{2 +} + 2 e^{-} \to 2 H g ⟹ E^{0} = 0.789 V

H g^{2 +} + 2 e^{-} \to H g ⟹ E^{0} = 0.854 V

H g_{2}^{2 +} \to H g + H g^{2 +}

K_{c}

H g^{2 +} + H g ⇌ H g_{2}^{2 +}

E_{2 H g / H g^{2 +}}^{o} = - 0.788 V

E_{H g_{2}^{2 +} / 2 H g^{2 +}}^{o} = - 0.920 V

H_{2} S

H g_{2}^{2 +}

Protactinium or Pa (Z = 91) =[Rn]5f26d17s2

Why we are writing [Rn]? Why 5f2 and Not 5f14?

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