Arrange the elements in increasing order of atomic radius na rb k mg
Answers
The increasing order of atomic radius is Mg<Na<K<Rb.
On moving down the group, the atomic radius increases. On moving from right to left in a period, the atomic radius decreases.
The elements in increasing order of atomic radius is Mg < Na< K< Rb
Explanation:
Atomic radii is the measure of the size of its atoms, usually the mean distance from the centre of the nucleus to the boundary of the surrounding shells of electrons.
The elements in the periodic table are arranged in order of increasing atomic numbers. The horizontal rows are called as periods and vertical columns are called as groups.
On moving across a period, the nuclear charge increases but electrons are being added to same shells and the effect of nuclear charge is more pronounced, thus the valence electrons are being tightly held by the nucleus, the atomic radii decrease.
On moving down a group, the nuclear charge increases but electrons are being added to new shells and the effect of addition of new shells is more pronounced, thus the valence electrons move far from the nucleus, the atomic radii increase.
As Na, K, Rb belong to same group in order of increasing atomic numbers and Mg lies right to the same period as that of Na.
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