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A heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe, at. wt.: 131.30, at. no.: 54.

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Crystal Field Theory

Theory of bonding in transition metal complexes in which ligands and metal ions are treated as point charges, a purely ionic model, ligand point charges represent the crystal (electrical) field perturbing the metal?s d orbitals containing nonbonding electrons.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.


Either the oxidation part or the reduction part of a redox reaction.

Coordination Compound or Complex

A compound containing coordinate covalent bonds.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Shielding Effect

Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.

Two chemistry egg tricks

The French have a saying: "You cannot cook an omelet without breaking eggs."Chemists hearing this proverb totally disagree. There is nothing easier than cleaning an egg without breaking its shell.
Probably our readers have already guessed how to do this, as it’s known that the hard shell of the egg is carbon dioxide, like chalk and marble.