3. Periodicity

For each question choose the answer you consider to be the best.1. An element is in period 3 and group 15 of the periodic table. How many electrons are present in the highest occupied energy level of this element?A. 3B. 5C. 13D. 152. Which species has the same configuration of electrons as a Mg2+ ion?A. Na atomB. F+ ionC. Ne atomD. O– ion3. Which element is a transition metal?

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