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regular Table

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

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For an ext information ~ above the Visual elements image watch the Uses and properties ar below.

Discovery day approx 1500BC
uncovered by -
beginning of the name Mercury is named after the planet, Mercury.


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

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

BlockElements room organised right into blocks through the orbital type in i beg your pardon the external electrons room found. These blocks are called for the characteristic spectra lock produce: sharp (s), principal (p), diffuse (d), and fundamental (f).

Atomic numberThe variety of protons in an atom.

Electron configurationThe arrangements of electrons over the critical (closed shell) noble gas.

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

Boiling point The temperature at which the liquid gas phase change occurs.

SublimationThe shift of a substance directly from the solid come the gas phase without passing v a liquid phase.

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

Relative atom massThe massive of an atom family member to the of carbon-12. This is about the amount of the number of protons and also neutrons in the nucleus. Where more than one isotope exists, the value offered is the abundance load average.

IsotopesAtoms of the same aspect with different numbers the neutrons.

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CAS numberThe chemistry Abstracts company registry number is a distinct identifier of a details chemical, draft to stop confusion emerging from various languages and also naming systems.