The electrical charge; also the ionic radius is different from the atomic radius.
When an atom loses or gains electrons, it becomes an ion.
When the number of electrons changes, the atom becomes an ion. An atom becomes a positively charged ion (cation) when it loses electrons and a negatively charged ion (anion) when it gains electrons.
Electron/s are removed from the atom.
If the number of protons changes, the atom becomes an entirely different element. Changing the number of neutrons creates isotopes of the same element, which can have different properties. Changing the number of electrons alters the atom's charge, turning it into an ion.
The number of an electron in a neutral atom is indicated by the atomic number, which is equal to the number of protons in the nucleus of the atom. In a neutral atom, the number of electrons is the same as the number of protons.
During a transfer of electrons between atoms, the number of electrons changes for each individual atom involved as electrons are gained or lost, but the overall number of electrons within the system remains constant. This is due to the law of conservation of matter, which states that matter can neither be created nor destroyed in a chemical reaction.
An atom with an atomic number of 20 has 20 electrons. The number of electrons in an atom is equal to its atomic number.
A neutral atom of uranium has 92 electrons. This is because the number of electrons is equal to the number of protons in the nucleus of an atom, and an atom is neutral when the number of electrons is equal to the number of protons. Uranium has an atomic number of 92, which corresponds to the number of protons and electrons in a neutral atom of uranium.
The number of electrons should equal the number of protons, otherwise you have an ion.
The number of protons is equal to atomic number; in a neutral atom the number of electrons is also equal to the numbers of protons.
The atomic number of an element can be used to determine the number of electrons in an atom. It is equal to the number of protons in the nucleus of an atom, which also corresponds to the number of electrons in a neutral atom.
If you mean a neutral atom (having no charge), the numbers of protons and neutrons can only change in a nuclear reaction. During a chemical reaction, the number of electrons can increase, resulting in a negatively charged ion, called an anion; or the number of electrons can decrease, resulting in a positively charged ion, called a cation. Whether an atom gains or loses electrons depends on which element it is.