Which element has the smallest atomic radius in the periodic table?
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helium has the smallest radius (31pm)in periodic table
kanishka747:
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Atomic radius :- It is the distance between nucleus and outermost electron.
in general increases down the group due to addition of new subshells and decreases across period due to increase effective nuclear charge.
Atomic radius of helium is 31pm ( 31 × 10^-12 m) . Helium has smallest atomic radius in the modern peroidic table due to complete filled subshell , highest ionisation potential and high effective mucleur charge .
so, answer is HELIUM (He) .
in general increases down the group due to addition of new subshells and decreases across period due to increase effective nuclear charge.
Atomic radius of helium is 31pm ( 31 × 10^-12 m) . Helium has smallest atomic radius in the modern peroidic table due to complete filled subshell , highest ionisation potential and high effective mucleur charge .
so, answer is HELIUM (He) .
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