An ionic compound is represented by a formula that lists the symbol for each element in the compound, with subscript numbers indicating the number of each atom present in a single molecule. For example, the ionic formula... More »

The molecular formulas of compounds express the number and type of atoms that make up one molecule of the compound. For example, the molecular formula of table salt, or sodium chloride, is NaCl. This means table salt has... More »

Na2S is the formula for sodium sulfide. Sodium sulfide is an ionic compound composed of two Na+ ions and one S2- ion. More »

To calculate the molecular weight of diethyl ether, determine the molecular formula, find the atomic weight of each atom, multiply the atomic weight the atom by the number of atoms of the element in the molecular formula... More » Science Chemistry Atoms & Molecules

Aluminum is an element and as such does not have a formula; its symbol is Al and atomic number is 13. The atomic mass of Al is 26.981539 amu and it is derived from bauxite. More »

An atom represents the smallest part of an element that still retains the characteristics of that element, and the bonding between two or more atoms forms a molecule. Molecules are often defined as the smallest part of a... More »

A molecule is made up of two or more atoms of the same element or compound, or different elements or compounds, that are chemically bound together. A molecule is a quantity of a substance that can be measured by a chosen... More »