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An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

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Solution

Homogeneous mixture of two or more substances.

Dubnium

Discovered : at both Berkeley, California, USA, and Dubna, near Moscow, Russia in 1970. Description:A highly radioactive metal which does not occur naturally, and of which only a few atoms have ever been made. It is of research interest only. Origin:The element is named after the Russian town of Dubna.

Ether

Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Saturated Solution

Solution in which no more solute will dissolve.

Hydride

A binary compound of hydrogen.

 

Three ways to make patina at home

The first way is ammonia patination. To do this, take a plastic container. Put a couple of paper or ordinary towels at the bottom. Moisten them with ammonia. Then sprinkle with large table salt.

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Salicylaldehyde

An oily, slightly water-soluble liquid, C7H6O2, having an almondlike odor: used chiefly in perfumery and in the synthesis of coumarin.