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Mass (symbolized m) is a dimensionless quantity representing the amount of matter in a particle or object. The standard unit of Mass in the International System (SI) is the kilogram (kg).

The Molar Mass of a compound defines the Mass of 1 mole of that particular substance and number of grams per mole of a compound. In other words, the Molar Mass is the total Mass of all the Atoms in grams that make a mole of a particular molecule. Therefore,

Mole Concept is known as the method used to express the amount of substance. A mole is defined as the amount of substance containing the same number of different entities (such as Atoms, Ions, and molecules) as the number of Atoms in a sample of pure 12C weighing precisely 12

The Atomic Mass of an element is the average Mass of the Atoms of an element measured in Atomic Mass unit (amu, also known as daltons, D). The Atomic Mass is a weighted average of all of the isotopes of that element, in which the Mass of each isotope is

An ion is a charged Atom or molecule. It is charged because the number of Electrons do not equal the number of protons in the Atom or molecule. An Atom can acquire a positive charge or a negative charge depending on whether the number of Electrons in an Atom is

Valency is the number of Atoms of a particular element that is combined with one Atom of another element to form a molecule. Valency is also known as molecular weight. Valency is a measure of the combining power of an Atom. The Valency of an element is determined by the