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
Save. element /ËÉlÉmÉnt/ noun. plural elements. element. /ËÉlÉmÉnt/. noun. plural elements. Learner's definition of ELEMENT. 1. [count] chemistry: one of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances.chemical elements. Water is composed of the elements hydrogen and oxygen.count] chemistry: one of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances. chemical elements. Water is composed of the elements hydrogen and oxygen.