Depends on their place on the Periodic Table.
A charged chlorine atom, or a chlorine ion, would have gained or lost an electron. If it gained an electron, it would have a charge of -1. If it lost an electron, it would have a charge of +1.
One electron was lost to form Cu+ from the neutral Cu atom.
You can determine how many electrons are gained or lost by looking at the atom's charge. If the atom gains electrons, it becomes negatively charged; if it loses electrons, it becomes positively charged. The difference between the atom's original and final charge tells you how many electrons were gained or lost.
ion can be produced when atom lose or gain electron when it lose electron it's converted to cation(+) but when gained it's converted to anion(-)
In the ion of barium, two electron are lost to follow the octet rule (to have a complete valence electron shell).
sodium must lose 1 electron, helium is a noble gas it is in group 8 check your periodic table, sufide ion must gain 2 electrons
the oxidation number
One electron is lost when a lithium atom forms a compound with fluorine atoms, as lithium has 1 valence electron and fluorine can gain one electron to achieve a full outer shell.
Only three electrons.
In oxygen, each atom gains two electrons to achieve a stable electron configuration through forming two covalent bonds. This means that each oxygen atom gains two electrons to reach a full valence shell.
Ionization level refers to the number of electrons that an atom has lost or gained, resulting in the formation of an ion. An atom with a positive ionization level has lost electrons and becomes positively charged, while an atom with a negative ionization level has gained electrons and becomes negatively charged.
The valence electrons of an atom determine its ability to form bonds and participate in chemical reactions. The oxidation number of an atom indicates the number of electrons it has gained, lost, or shared in a chemical compound. The valence electrons of an atom can help determine its oxidation number by considering how many electrons the atom needs to reach a stable configuration.