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How many elements are there in first period of modern periodic table |
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Answer» two elementsThere are seven periods in the periodic table, with each one beginning at the far left. 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.Explanation:Hope it HELPS you |
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