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Which of the following represent the correct order of increasing 2^nd ionization enthalpy for 3^rd period elements.

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$M g < S i < A l < P < S < C l < A r < N a$

$N a < A l < M g < S i < S < P < C l < A r$

$M g < A l < S i < P < S < C l < A r < N a$

$M g < S i < A l < P < C l < S < A r < N a$

answer is D.

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Based on electronic configuration of unipositive ion.

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