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Asked by Vishal Last Modified
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Raja Shekar
Chemistry- neet and mains and iit foundation teacher from last 3 years in krishnaswany narayana
Atomic radius is one of the periodic properties, the distance between the nucleus and outer most shell of electrons in the same atom is called the nuclear radius. So in groups the microscopic size increases from top to bottom and also increases the atomic radius .in periods the atomic size decreases from left to right so atomic radius decreases in periods.
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Vishaka Bhutia
Home Tutor
Atomic radius generally decreases from left to right across a period. This is because within a period, the outer electrons are present in the same valence shell and the atomic number increases from left to right across a period, resulting in an increased effective nuclear charge. As a result, the attraction of electrons to the nucleus increases.
On the other hand, the atomic radius generally increases down a group. This is because down a group, the principal quantum number (n) increases which results in an increase of the distance between the nucleus and valence electrons.
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