Q. 1 B4.0( 10 Votes )
On what basis are they arranged now?
Now they are arranged on the basis of their atomic number. The number of protons in the nucleus of the atom is the atomic number of that element.
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Account for the following:
a. Cations are smaller in size than the corresponding atom.
b. The noble gases were discovered very late.Xam idea - Science
Why are isotopes of an element having different atomic masses placed at the same position in the periodic Table?Xam idea - Science