Question

What are ions write the formula of two divalent cation and anions each

Answer 1

positively or negativity charged atoms are called ions, in simple words an atom which develops a charge on it is an ion.
formula for divalent cation : Ca^2+ , Mg^2+
formula for divalent anion : SO4^2- , CO3^2-

Answer 2

An ion is a chemical species with a net electric charge formed when a neutral atom or a group of atoms accepts or donates one or more electrons. Ions are of two types - cations and anions. The cations are formed when a neutral atom loses one or more electrons. It has less electrons than the neutral atom and is therefore positively charged. Example sodium atom (Na) on losing an electron forms sodium cation, denoted by Na+, calcium atom on losing two electrons forms calcium ion, denoted by Ca2+. Similarly, anions are formed when neutral atom gains one or more electrons. It has more electrons than the neutral atom and is therefore negatively charged. chlorine forms a negative chloride ion, Cl- (anion) by accepting one electron.