Explain please why the 1st period of the modern periodic table has only 2 element??
Answer (1)
Student Expert
17th Jan, 2021
The first electron shell of an atom that is the K shell, it has the capacity of 2 electrons only. Hydrogen and helium have 1 and 2 electrons each respectively so they only can fit in the first periodic table. The 2nd table has 8 electrons capacity.
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