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The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p-block. All of the period 3 elements occur in nature and have at least one stable isotope. [1]
29 Σεπ 2019 · Lithium is the third element on the periodic table. This lightweight metal would float on water, but then it would react and burn. The metal oxidizes black in the air. You aren't likely to encounter it in its pure form because it is so reactive.
Period 3 elements. From left (in their periodic table order) they are: sodium (Na); magnesium (Mg); aluminium (Al); silicon (Si); phosphorus (P, white/red); sulphur (S); chlorine (Cl); and argon (Ar). Successive elements across the period, have a single electron added, and this causes immense changes in the chemical and physical properties.
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
Click each element to read detailed information. Interactive periodic table with element scarcity (SRI), discovery dates, melting and boiling points, group, block and period information.
Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!
4 Μαρ 2024 · Revision notes on Physical Properties of the Period 3 Elements for the CIE A Level Chemistry syllabus, written by the Chemistry experts at Save My Exams.
