Curiously, this most common of atomic parts has only a fuzzy estimate of size.
Linus Pauling says "The radius of the electron has not been determined exactly, but it is known to be less than 1 X 10-13 cm".
So roughly the electron is 1/1000 the size of a proton. Maybe. But a cooler answer is-- physicists are annoyed by the question. A good case can be made for other sizes, even huge sizes....because the properties of the electron OTHER than it's size are the ONLY important ones. In fact the size of atomic pieces smaller than the nucleus usually does not matter at all....and may in fact have no meaning. After all, how do you propose to measure these guys?
The electron is known to be a point particle down to a limit of 10^-18m. It, as far as we know does not have a classical "size".
The ATOM decreases in size when it loses an electron and increases when electrons are added.
what is of an electron
It is impossible to know exactly where an electron is. Thus, the size of an electron cloud can be given only in terms of probability. Even then, the size of the electron cloud depends on how many electrons an atom possesses.
THIS is the electron cloud.
When an atom gains an electron it increases in size, and when it loses an electron it decreases in size.
electron is the smallest
an atom is larger than an electron
An electron is not the largest part of an atom. An electron is the smallest component of an atom. Relatively, if a neutron or proton were 1 unit in size, an electron would be 1/1840 units in size.
If the electron were the size of a golf ball, the proton would be about the size of a basketball and the electron would be orbiting about 8000 meters away (assuming the Bohr model of the atom).
The size of a laser or electron beam is measured in milliradians. This is because they are subject to divergence.