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3 November, 12:09

Which of the following has the highest atomic size? A beryllium B strontium C barium D radium

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  1. 3 November, 15:50
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    Answer: D. Radium

    Explanation: The atomic size of an atom increases when it moves down in a group. The number of energy levels increases due to the increase number of electrons. This contributes to the increase in atomic size since energy orbitals becomes farther from the nucleus.
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