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Robert Kearns · Answer 1 · 2019-01-25T00:23:53+0000

Answer:

A. The nucleus of barium (Ba) repels the electrons with more force than in magnesium (Mg), pushing them further away from the nucleus.

Step-by-step explanation:

Alex Moore · Answer 2 · 2019-01-28T08:31:11+0000

Barium has a larger atomic radius because it has more energy levels and a larger shielding effect. Silicon has a smaller atomic radius because it has a stronger nuclear charge.

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