Periodic table of elements periods Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3; it is usually shown at the foot of the table to save space. 1 electrical conductivity of radium 2 There are currently seven complete periods in the periodic table, comprising the known elements. Any new elements will be placed into an eighth period; see extended periodic table. The elements are colour-coded below by their block: red for the s-block, yellow for the p-block, blue for the d-block, and green for the f-block. 3 what element is 4f 3 4 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!. 5 Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups. 6 Periodic Table of Chemical Elements. The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number. 7 ar 4s2 3d5 element 8 Periodesystemet, også kalt periodetabellen eller det periodiske system, er en tabell som klassifiserer grunnstoffene i perioder. 9 Elements from period one and two of the periodic table, namely, hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon. 10 This was interpreted in terms of the electronic structure of atoms by Niels Bohr in In this table there are periods of increasing length between the noble gases; the table thus contains a period of 2 elements, two of 8 elements, two of 18 elements, one of 32 elements, and an incomplete period. 11