The ion given is formed when the neutral arsenic atom gains three electrons.
Atoms typically do not lose protons because that would change the identity of the element. Instead, atoms can lose or gain electrons to form ions with a different charge. Protons are not generally lost by atoms in chemical reactions.
Atomic number of arsenic is 33 so that would leave you with 36 electrons
Iron can both gain and lose electrons depending on the reaction it is involved in. In general, iron tends to lose electrons to form positively charged ions, such as Fe2+ or Fe3+, but it can also gain electrons to form negatively charged ions, such as Fe2-.
When atoms gain or lose electrons, they become negatively charged if they gain electrons (anions) or positively charged if they lose electrons (cations). These charged atoms are known as ions.
Beryllium typically loses electrons to form a +2 ionic charge. It is easier for beryllium to lose its outermost electrons than to gain new ones due to its small atomic size.
Arsenic becomes an ion by gaining or losing electrons. It can either gain three electrons to form the As3- ion (arsenide ion) or lose three electrons to form the As3+ ion (arsenite ion), depending on the reaction conditions.
Selenium typically gains two electrons to achieve a stable electron configuration, forming the Se2- ion. Arsenic typically loses three electrons to achieve a Noble Gas electron configuration and forms the As3+ ion.
Lose
When atoms lose or gain electrons, they form ions. These are charged particles.
Se will gain electrons
Lose electrons is oxidation. To gain electrons is reduction.
Silicon (Si) can gain or lose 4 electrons. It can either gain 4 electrons to have a stable octet configuration or lose 4 electrons to achieve a stable configuration.
If you mean Metals... No, they do not gain electrons, they actually lose electrons because it is a lot easy for them to lose them so they can gain stability much faster.
it loses electrons
Electrons
Atoms typically do not lose protons because that would change the identity of the element. Instead, atoms can lose or gain electrons to form ions with a different charge. Protons are not generally lost by atoms in chemical reactions.
Selenium may lose 2, 4 or 6 electrons and may gain 2 electrons.