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Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

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Isomers

Different substances that have the same formula.

Magnetic Quantum Number (mc)

Quantum mechanical solution to a wave equation that designates the particular orbital within a given set (s, p, d, f ) in which a electron resides.

Crystal Lattice

A pattern of arrangement of particles in a crystal.

Insulator

Poor electric and heat conductor.

Essential Oil

A plant extract that has a distinctive odour or flavour.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Atomic Mass Unit (amu)

One twelfth of a mass of an atom of the carbon-12 isotope, a unit used for stating atomic and formula weights, also called dalton.

Dosimeter

A small, calibrated electroscope worn by laboratory personnel and designated to detect and measure incident ionizing radiation or chemical exposure.

Standard Reaction

A reaction in which the numbers of moles of reactants shown in the balanced equation, all in their standard states, are completely converted to the numbers of moles of products shown in the balanced equation, also sall at their standard state.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.