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16 November, 19:26

Which of the are not true in regarding to atomic raqdii of main group elements.

a. Atomic radii generally increase as you move from left to right across a period

b. atomic radii size is related to the number of electrons in the valence level and the number of protons in the nucleus.

c. atomic radii decrease size when the pull of electrons forward the nucleus of an atom is greater

d. atomic radii generally increase as you move down a group

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  1. 16 November, 19:39
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    The statement that would be incorrect would be the first option, option A. Atomic radii would generally decrease as you move from left to right across the periodic table. This is because, assuming that you have the same number of shells, every additional electron that is added will cause an attractive pull by the nuclei and the electrons present in their respective energy levels, causing the distance from the nuclei to the valence shell to be smaller.
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