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An element has configuration 2, 8, 1. It belongs to, _________.

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An element has configuration 2, 8, 1. It belongs to, _________.

1.1 group and 3rd period

2.3 group and 1st period

3.1 group and 8th period

4.17 group and 3rd period

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1.1 group and 3rd period

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