How Many Elements Are There In The Second And The Third Periods Of The Periodic Table❔
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Answer: in the second period of periodic table there are 8 elements : lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.
in third period also there are 8 elements : sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon.
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