Question

Which of the two :na or mg has higher second ionization enthalpy?

Answer 1

Na - atomic number-11

Electronic configuration- 2,8,1

Mg- atomic number -12

Electronic configuration-2,8,2

First ionisation enthalpy for Na is less,as it is easier to remove 1 electron from it's outermost shell.

For Mg also, it is easier to remove and electron

Electronic configuration when 1 electron is removed

Of Na -2,8

Of Mg- 2,8,1

Second ionisation enthalpy

Now to remove an electron from the outermost shell of Na we have to apply more energy as Na has attained a STABLE electronic configuration.

But to remove electron from the outermost shell of Mg not much energy is required. Thus Na has second higher ionisation enthalpy

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