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NEET levelSingle correct optionDifficulty 1 of 3pt064

Which of the following represents the correct increasing order of atomic radii?

A $Sr < Ca < Mg < Be$
B $Mg < Be < Ca < Sr$
C $Be < Ca < Mg < Sr$
D $Be < Mg < Ca < Sr$

Answer: D

Down a group a new shell is added at each step, so the radius increases: Be (2 shells) < Mg (3) < Ca (4) < Sr (5).

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