ATOMIC RADIUS AND RADII, Slides of Chemistry

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Atomic and

Ionic Radius

By Jana and Mehar

Atomic radius Trend The atomic radius of an element is a measure of the size of an atom. It is the distance between the nucleus of an atom and the outermost electron shell. Atomic radii generally decrease across each period. And they increase down each group

Ionic radius Trend The ionic radius of an element is a measure of the size of an ion Ionic radius increases down the group as the number of shells increases Ionic radii increase with increasing negative charge And decrease with increasing positive charge.

Question! Which option shows atoms in order of decreasing atomic radius? A. N > C > Be > Mg B. Mg > N > C > Be C. Be > C > N > Mg D. Mg > Be > C > N

Size of an atom when it is an ion

State and explain which is bigger, the lithium atom or the lithium ion (Li+ ).

Lithium atom lithium ion

Ionic radii decrease with increasing positive charge.

Question! Arrange the following in order of increasing atomic radius (smallest first): Cl, Si, Na. A. Cl > Si > Na B. Si > Na > Cl C. Na > Si > Cl D. Cl > Na > Si

Answer. The correct answer is : Cl > Si > Na Cl, Si and Na are all in the same period. Atomic radius decreases across the period Therefore Cl has the smallest atomic radius and Na has the largest atomic radius