Answer in Brief
Write scientific reason.
Atomic radius goes on increasing down a group.
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Solution
Atomic radius increases as we move from top to bottom in a group of the periodic table because a new shell of electrons is added to the atoms at every step. As the number of shells in the atoms increases gradually due to which the size of atoms also increases. As the size of the atoms increases which leads to an increase in the atomic radius of an atom.
Concept: Periodic Properties - Periodic Properties: Atomic Radius Or Atomic Size
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