Types of Radii

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akroberts
Posts: 24
Joined: Fri Sep 28, 2018 12:16 am

Types of Radii

Postby akroberts » Wed Oct 10, 2018 5:26 pm

What is the difference between the regular radius, covalent radius, and ionic radius, and how do we apply them?

anthony_trieu2L
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Types of Radii

Postby anthony_trieu2L » Thu Oct 11, 2018 12:26 pm

The radius of an atom is the distance from the center of the nucleus to the edge of the farthest electron cloud. A covalent radius is formed when two of the same elements are covalently bonded to one another. This radius can be determined using half of the distance between the two nuclei. Lastly, an ionic radius is the radius of an atom's ion. The radius of an atom changes depending on whether it loses or gains an electron. When an atom loses an electron, its radius decreases (and vice versa).

mayra martinez 1D
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

Re: Types of Radii

Postby mayra martinez 1D » Thu Oct 11, 2018 10:47 pm

A regular atomic radius is the distance between the nucleus and the last electron cloud.
A covalent radius is half the distance between the nuclei of the newly-bonded atoms. The diameter would be the full distance between the two nuclei.
An ionic radius is similar to the atomic radius; its the distance between the nucleus and the electron in the outermost shell of an ion. If an atom gains an electron thus becoming an anion, the size of its radius increases. If an atom loses an electron thus becoming a cation, the the size of its radius decreases


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