why 5th period of periodic table has 18 elements?
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Beacause Sciences don't know alll elements name
sarthakbuster:
but this is not real answer
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bcoz While filling 5th shell according to aufbau principle 5s,5p.4d filled so 2 +6 +10 =18 electrons or elements are present in 5th shell. ... Further we start filling the 4d orbital which can take 10 electrons. So in the 4th principal quantum energy stater, we can fill 18electrons. Thus 5th period has 18 elements.
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