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    Question

    With the increase of the effective nuclear charge, the

    size of the atom or ion 
    A increases Correct Answer Incorrect Answer
    B decreases Correct Answer Incorrect Answer
    C remain the same, since it has no bearing on size Correct Answer Incorrect Answer
    D it will depend on period to period and group to group Correct Answer Incorrect Answer

    Solution

    The effective nuclear charge is the net positive charge experienced by an electron in a multi-electron atom. The term "effective" is used because the shielding effect of negatively charged electrons prevents higher orbital electrons from experiencing the full nuclear charge by the repelling effect of inner-layer electrons. The effective nuclear charge experienced by the outer shell electron is also called the core charge. It is possible to determine the strength of the nuclear charge by looking at the oxidation number of the atom. 

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