Why does the first periodic table contanin only two element ?
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These element can only hold two electrons, both in the 1s orbital, Therefore, period table can only have two elements
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The first period has less elements than any other periods in the periodic table. There are only two elements in the first period: hydrogen and helium. We can explain why there is less elements in the first row in modern theories of atomic structure. ... These elements can only hold two electrons, both in the 1s orbital.
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