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Why Classification?

State the pos...

Question

State the position of cerium (z = 58) and uranium (z = 92) in periodic table?

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Solution

Atomic Number element symbol group Block
$58$ Cerium $C e$ $19$ $F$
$92$ Uranium $U$ $20$ $F$

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Q. I learnt from a video in YouTube about the periodic table according to which I have a doubt.

I learnt that hydrogen is the lightest element, it has atomic number:1. Uranium is the heaviest element, having atomic no. :92.
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Periodic table doesn't end with Uranium, it ends with an element having atomic no. :118 because that scientists have created some man made elements too. But if there is an element having atomic no.:118,is Uranium still the heaviest element? If so, why is Uranium isn't the last one in the periodic table?

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