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Which of the following places the elements in the correct order of increasing first ionization energy?

ACa, Mg, Be

BF, O, N

CLi, Na, K

DSi, P, S

Verified Answer :

scme1702
ACa, Mg, Be
The first ionization energy increases as we move up a group because of the smaller atomic size and less shielding of electrons.
JBoyStudios

A) Ca, Mg, Be

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