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A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.

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Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Associated Ions

Short-lived species formed by the collision of dissolved ions of opposite charges.

Supercooled Liquids

Liquids that, when cooled, apparently solidify but actually continue to flow very slowly under the influence of gravity e.g glass.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Polarization

The buildup of a product of oxidation or a reduction of an electrode, preventing further reaction.

Halogens

Group VIIA elements: F, Cl, Br, I

Natural Radioactivity

Spontaneous decomposition of an atom.

Yellowcake

The solid form of mixed uranium oxide, which is produced from uranium ore in the uranium recovery (milling) process.

Period

The elements in a horizontal row of the periodic table.

The most expensive metal in the world

Do you think the most expensive metal is gold? No! On earth there are more valuable metals. But we need to divide the value of metals that occur in nature, and metals - isotopes, which are obtained in special laboratories. Let’s look at natural metals first.