Periodic trends are those properties which change periodically in group or period.
As we know elements are arranged in periodic table according to their atomic weights in ascending order.
Atomic radius - atomic radius decreases in period and increases in group
according to electronic configuration new electron is added to the same orbital in period hence atomic radius decreases
but in group new electron is added to new orbital hence atomic radius increases
effective nuclear charge is the thing to be considered here
as in the period electron is added to same orbital, positive charge applied by nucleus on electron increases and due to this effect atomic radius decreases
As we know elements are arranged in periodic table according to their atomic weights in ascending order.
Atomic radius - atomic radius decreases in period and increases in group
according to electronic configuration new electron is added to the same orbital in period hence atomic radius decreases
but in group new electron is added to new orbital hence atomic radius increases
effective nuclear charge is the thing to be considered here
as in the period electron is added to same orbital, positive charge applied by nucleus on electron increases and due to this effect atomic radius decreases
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