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Why the atomic radii of noble gases is the largest in their respective periods ?

Why the atomic radii of noble gases is the largest in their respective periods ? 

Grade:12

2 Answers

Arun
25750 Points
4 years ago
Because, in the same period, the atoms have equal number of orbits. And due to periodic laws, as we go right along with the period, the radii decreases due to attraction between more number (as we go right, the atomic number i.e. number of protons and electrons increases) of protons and electrons in a fixed space (In a period number of orbits remains fixed). But as there are 8 electrons in the outermost shell of atoms of inert gases, the repulsion between them causes the atom to be bigger than the same period Halogens. But they are never bigger than the atoms situated in the extreme left of the table.
Khimraj
3007 Points
4 years ago
The Covalent and Van der Waals radiidecrease with increase in atomicnumber as we move from left to right in a period. The alkali metals at the extreme left of the periodic table have the largest size in a period. ... Afternitrogen, atomic size increases for Oxygen and then decreases for fluorine.

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