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allotrope Some elements exist in several different structural forms, dubbed allotropes. Each allotrope has different physical properties.

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For an ext information top top the Visual facets image check out the Uses and also properties ar below.

Discovery date 1861
discovered by wilhelm Crookes
origin of the name Thallium is derived from the Greek "thallos", definition a eco-friendly twig.


GroupA vertical pillar in the periodic table. Members that a group generally have comparable properties and electron configuration in their external shell.

PeriodA horizontal heat in the regular table. The atomic number of each element increases by one, reading from left to right.

BlockElements space organised right into blocks by the orbital form in i m sorry the outer electrons are found. These blocks are named for the properties spectra lock produce: sharp (s), principal (p), diffusive (d), and fundamental (f).

Atomic numberThe variety of protons in one atom.

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

Melting pointThe temperature in ~ which the solid-fluid phase adjust occurs.

Boiling point The temperature in ~ which the liquid–gas phase adjust occurs.

SublimationThe change of a substance directly from the solid to the gas step without passing v a liquid phase.

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

Relative atom massThe massive of an atom relative to that of carbon-12. This is approximately the sum of the variety of protons and neutrons in the nucleus. Where much more than one isotope exists, the value provided is the abundance weighted average.

IsotopesAtoms that the same aspect with different numbers that neutrons.

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CAS numberThe chemistry Abstracts service registry number is a unique identifier that a details chemical, design to prevent confusion developing from various languages and naming systems.