Respuesta :
The element helium is considered smaller than hydrogen because of the increase in the number of shells in the periodic table.
What is a periodic table?
A periodic table is an arrangement for the elements to better learn and understand the properties and elements and gives information about the number of shells and effective nuclear charges on the atom.
Helium is present at the right in the periodic table and from moving hydrogen to helium the number of orbitals or inner shells increases which also increases the effective nuclear charge and size becomes small.
Therefore, because of the increase in the number of shells in the periodic table.The element helium is considered smaller than hydrogen.
Learn more about the periodic table, here;
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