region occupied by the electrons
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The radius of an atom extends to the outer edge of its electron cloud, which is the region where electrons are most likely to be found in. The electron cloud represents the volume of space where electrons can exist around the nucleus of an atom.
The edge of an atom is defined by the outermost electrons in its electron cloud. These electrons are located in the outer energy levels and are involved in chemical reactions. At the edge of the atom, there is a sharp decrease in electron density, marking the boundary of the atom.
The atomic radius is the distance from the nucleus to the outermost electron shell of an atom. It is a measure of the size of an atom. Atomic radius generally decreases across a period from left to right due to increasing nuclear charge, and increases down a group due to additional electron shells.
Examples of a radius in math include the line segment from the center to a point on a circle, the distance from the center to the edge of a sphere, or the distance from the center to a point on a cone's base. Non-examples could be any line that doesn't go from the center of a circle to its edge or any measurement that doesn't start at the center of a sphere and reach its surface.
If you apply force to the outer edge of the door, this gives you the most leverage.
The cell membrane