What’s the difference between cation and an anion

When atoms gain or lose electrons from their outer shell they are called either a cation or an anion. When one atom gives an electron to another atom, the atom either gains or loses electrons. When one atom loses an electron, it's called a cation. A cation is an atom which has a positive charge. On the other hand, when an atom gains an electron, it's called an anion. An anion is a atom with a negative charge.

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

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a is the answer to this question

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