What is the number of elements in :
1. 1st period and
2. 2nd period of modern periodic table.
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Explanation:
Elements 95 to 118 have only been synthesized in laboratories or nuclear reactors.
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Answer:
There 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.
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