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An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

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Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.

Square Planar Complex

Complex in which the metal is in the center of a square plane, with ligand donor atoms at each of the four corners.

Equilibrium or Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, the state of a system when neither forward or reverse reaction is thermodynamically favored.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Neutralization

The reaction of an acid with a base to form a salt and water. Usually, the reaction of hydrogen ions with hydrogen ions to form water molecules.

Polarimeter

A device used to measure optical activity.

Electrochemistry

Study of chemical changes produced by electrical current and the production of electricity by chemical reactions.

Essential Oil

A plant extract that has a distinctive odour or flavour.

Insulator

Poor electric and heat conductor.

Accuracy

How closely a measured value agrees with the correct value.