Atomic radius decreases across a period from left to right, except for the noble gases.
Down a period the atomic radius increases as the number of shells (or energy levels) increases. Across a period the atomic radius decreases as the effective nuclear charge increases.
Atomic radius increases down a group on the periodic table because with each additional period an energy level is added.
Argon doesnt have the smallest atomic radius, its chlorine.Argon has the largest atomic radius in period 3.
Neon (Ne) in the second period on the periodic table of the elements has the highest atomic number in that period of 10.
The atomic radius decreases along a period. It is because of increasing effective nuclear charge along a period.
Fluorine
Indium has the largest atomic radius among elements in its period because of the shielding effect. With more electron shells, the outer electrons are further from the nucleus, resulting in a larger atomic radius.
Sodium has a larger atomic radius than aluminum because as you move down a group in the periodic table, the atomic radius increases due to the addition of energy levels. Sodium is located in the third period, while aluminum is in the second period, so sodium has more energy levels and a larger atomic radius.
The smallest atomic radius in period 5 belongs to the element with the highest nuclear charge, which is iodine (I) from Group 17. This is because as you move across a period, the nuclear charge increases, leading to stronger attraction for the electrons and a smaller atomic radius.
Along a period, nuclear charge increases. hence, atomic radius decreases.
Group-1 has largest atomic radius. It decreases across a period
Along a period, nuclear charge increases. hence, atomic radius decreases.