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Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

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Overlap

The interaction of orbitals on different atoms in the same region of space.

Line Spectrum

An atomic emission or absorption spectrum.

DP number

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

Solvent

The dispersing medium of a solution.

Electrolysis

Process that occurs in electrolytic cells.

Percent by Mass

100% times the actual yield divided by theoretical yield.

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Accuracy

How closely a measured value agrees with the correct value.

Dispersing Medium

The solvent-like phase in a colloid.

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.