how would you justify the presence of 18 elements in 4th period?
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it is theory to be remembered
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Hey dear!!!
In period -4 18th element is Krypton (Kr). it is non reactive because it have full filled electrons and it's other name is noble gas
In period -4 18th element is Krypton (Kr). it is non reactive because it have full filled electrons and it's other name is noble gas
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