Identify the position of an element that has a configuration 2,8,7 in the periodic table.

1st group and 3rd period

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3rd group and 1st period

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1st group and 8th period

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17th group and 3rd period

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Solution

The correct option is A
1st group and 3rd period

The element has 3 shells which mean its in the 3rd period. The outer shell has seven electron that places this element in the seventh group.

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Identify the position of an element that has a configuration 2,8,7 in the periodic table.

The correct option is A 1st group and 3rd period The element has 3 shells which mean its in the 3rd period. The outer shell has seven electron that places this element in the seventh group.

The correct option is A
1st group and 3rd period

The element has 3 shells which mean its in the 3rd period. The outer shell has seven electron that places this element in the seventh group.