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periodic Table

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

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For much more information on the Visual elements image check out the Uses and also properties section below.

Discovery day 1790
discovered by Adair Crawford
beginning of the name Strontium is called after Strontian, a little town in Scotland.


GroupA vertical shaft in the regular table. Members of a group typically have similar properties and also electron configurations in their external shell.

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

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

Atomic numberThe number of protons in one atom.

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

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

Boiling point The temperature in ~ which the lpg phase readjust occurs.

SublimationThe shift of a substance straight from the solid to the gas step without passing through a liquid phase.

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

Relative atom massThe mass of one atom family member to the of carbon-12. This is about the amount of the variety of protons and neutrons in the nucleus. Where an ext than one isotope exists, the value provided is the abundance weight average.

IsotopesAtoms of the same element with various numbers that neutrons.

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CAS numberThe chemistry Abstracts business registry number is a unique identifier the a certain chemical, draft to protect against confusion emerging from various languages and naming systems.