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periodic Table

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allotrope Some elements exist in several various structural forms, referred to as allotropes. Each allotrope has different physical properties.

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Discovery date 1807
found by Humphry Davy
origin of the name The surname is obtained from the English native "potash".


GroupA vertical pillar in the periodic table. Members of a group typically have comparable properties and electron configurations in their external shell.

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

BlockElements room organised right into blocks through the orbital type in which the external electrons room found. This blocks are named for the characteristic spectra they produce: sharp (s), major (p), diffusive (d), and an essential (f).

Atomic numberThe number of protons in an atom.

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

Melting pointThe temperature in ~ which the solid–liquid phase adjust occurs.

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

SublimationThe shift of a substance directly from the solid to the gas phase without passing with a fluid phase.

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

Relative atom massThe massive of one atom loved one to that of carbon-12. This is roughly the amount of the variety of protons and also neutrons in the nucleus. Where an ext than one isotope exists, the value provided is the abundance load average.

IsotopesAtoms the the same element with different numbers the neutrons.

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CAS numberThe chemical Abstracts organization registry number is a distinctive identifier of a particular chemical, design to prevent confusion developing from different languages and naming systems.