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Why is the second ionization energy of magnesium much lower than the ionization energy of sodium?

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Anonymous Posted

Why is the second ionization energy of magnesium much lower than the ionization energy of sodium?

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shaikh afsha

Dear All,

Sodium is placed in 1st group of periodic table,while magnesium is placed in 2nd group,hence electrons are more strongly bounded to sodium than magnesium. So energy required to eject an electron from sodium is more than that of magnesium, hence ionization energy of sodium is more  than that of magnesium.  
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Kirti Yadav

the atomic number of magnesium is 12. its electronic configuration is: 1s(2)2s(2)2p(6)3s(2). after the first electron is taken out, magnesium ion will have 11 electrons. as you know elements have the tendency to acquire the electronic configuration of nearest nobel gas, as it ia moat stable. so magnesium will readily lose electron to achieve configuration of neon. hence the second ionisation is much lower than first one.

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