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what do elements li, be, b, n, c, o, & f have in common?

The symbols, Li, Be, B, C, N, O, F, and Ne are all in the same period (row). The periods are numbered from 1 through 7. The symbols Li, Be, B, C, N, O, F, and Ne are all in period 2.
Elements in period 2 all have two energy levels surrounding their nucleus. The period number always equals the number of energy levels that the atoms of an element in that period have.

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