which one has High second ionization enthalpy
1s²2s²2p6 3s¹
1s²2s²2p⁴
1s²2s²2p5
1s²2s²2p6 3s²
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Sodium has 11 electrons which can be written as (2, 8, 1). It's outer orbit has 1 electron When it is ionized for the first time, the outer most electron is removed very easily, so that it can form the electronic configuration of the nearest inert gas Neon (2, 8).
Neon has 8 electrons in its outermost orbit. Thus it is highly stable. Now, when the second electron is removed, a very very high amount of energy is required because it doesn't want to give away one of its outermost electron by disrupting its stability.
Thus, second ionization energy of sodium is extremely high.
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