how many elements are present in each period
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A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements.
Answered by
1
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period 1 has only two elements ( hydrogen and helium ) while periods 2 and 3 have 8 elements. periods 4 and 5 have 18 elements.
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