For example, 2 + 3 + 5 = 10 is an equation. Chemistry A written representation of a chemical reaction, in which the symbols and amounts of the reactants are separated from those of the products by an equal sign, arrow, or a set of opposing arrows. For example, Ca(OH) 2 + H 2 SO 4 = CaSO 4 + 2H 2 O, is an equation.
an element is a pure substance that is made from a single type of atom elements are the building blocks for all the rest of the matter in the world examples of elements include iron oxygen hydrogen gold and helium
Definition of 'element'. element. The different elements of something are the different parts it contains. The exchange of prisoners of war was one of the key elements of the U.N.'s peace plan. A particular element of a situation, activity, or process is an important quality or feature that it has or needs.