| Element | $IE_1$ | $IE_2$ | $IE_3$ | Code | Element |
| $1$ | $2080$ | $3963$ | $6130$ | $(a)$ | $H$ |
| $2$ | $520$ | $7297$ | $11810$ | $(b)$ | $Li$ |
| $3$ | $900$ | $1758$ | $14810$ | $(c)$ | $Be$ |
| $4$ | $800$ | $2428$ | $3660$ | $(d)$ | $B$ |
| - | - | - | - | $(e)$ | $Ne$ |
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| List-$I$ ($IE_1, IE_2, IE_3$ in $kJ \ mol^{-1}$) | List-$II$ (Element) |
|---|---|
| $A$. $1510$ | $1$. $H$ |
| $B$. $495, 6500, 10200$ | $2$. $Li$ |
| $C$. $840, 1630, 13100$ | $3$. $Be$ |
| $D$. $600, 2050, 3100$ | $4$. $B$ |
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