Chemistry, 30.09.2019 21:30 fffcc7665

An atom of an element has 28 innermost electrons and 7 outermost electrons. in which period of the periodic table is this element located?

1. 5

2. 2

3. 3

4. 4

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An atom of an element has 28 innermost electrons and 7 outermost electrons. in which period of the p...