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allotrope Some aspects exist in several various structural forms, called allotropes. Each allotrop has various physical properties.

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For an ext information on the Visual aspects image check out the Uses and properties ar below.

Discovery day 1843
uncovered by Carl Gustav Mosander
origin of the name Terbium was named after Ytterby, Sweden.


GroupA vertical column in the routine table. Members of a group typically have similar properties and also electron configuration in their external shell.

PeriodA horizontal heat in the routine table. The atomic variety of each aspect increases by one, reading from left come right.

BlockElements space organised right into blocks through the orbital form in i beg your pardon the external electrons space found. These blocks are called for the characteristic spectra lock produce: spicy (s), primary (p), diffuse (d), and basic (f).

Atomic numberThe variety of protons in one atom.

Electron configurationThe species of electrons above the last (closed shell) noble gas.

Melting pointThe temperature at which the solid liquid phase adjust occurs.

Boiling point The temperature at which the lpg phase adjust occurs.

SublimationThe change of a substance directly from the solid come the gas phase without passing through a liquid phase.

Density (g cm−3)Density is the mass of a substance that would certainly fill 1 cm3 in ~ room temperature.

Relative atom massThe mass of an atom loved one to the of carbon-12. This is roughly the amount of the variety of protons and neutrons in the nucleus. Where much more than one isotope exists, the value given is the abundance weighted average.

IsotopesAtoms of the same aspect with different numbers the neutrons.

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CAS numberThe chemical Abstracts organization registry number is a unique identifier of a specific chemical, design to protect against confusion emerging from various languages and naming systems.