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The halogens fluorine, chlorine, bromine, and iodine are nonmetals; the chemical properties of astatine and tennessine, two heaviest group 17 members, have not been conclusively investigated. The halogens show trends in chemical bond energy moving from top to bottom of the periodic table column with fluorine deviating slightly.
In the periodic table, tennessine is expected to be a member of group 17, the halogens. [c] Some of its properties may differ significantly from those of the lighter halogens due to relativistic effects. As a result, tennessine is expected to be a volatile metal that neither forms anions nor achieves high oxidation states.
Chlorine is the second halogen, being a nonmetal in group 17 of the periodic table. Its properties are thus similar to fluorine , bromine , and iodine , and are largely intermediate between those of the first two.
The halogens darken in colour as the group is descended: fluorine is a very pale yellow, chlorine is greenish-yellow, bromine is reddish-brown, and iodine is violet. Elemental iodine is slightly soluble in water, with one gram dissolving in 3450 mL at 20 °C and 1280 mL at 50 °C; potassium iodide may be added to increase solubility via ...
Bromine is the third halogen, being a nonmetal in group 17 of the periodic table. Its properties are thus similar to those of fluorine , chlorine , and iodine , and tend to be intermediate between those of chlorine and iodine, the two neighbouring halogens.
The metals of group 2: Be, Mg, Ca, Sr, Ba, Ra Transition elements * Elements in groups 3 to 11 or 3 to 12 (the latter making up the d-block) Pnictogens: The elements of group 15: N, P, As, Sb, Bi † Chalcogens: The elements of group 16: O, S, Se, Te, Po † Halogens: The elements of group 17: F, Cl, Br, I, At † Noble gases
Atomic number (Z): 9: Group: group 17 (halogens) Period: period 2: Block p-block Electron configuration [] 2s 2 2p 5 [3Electrons per shell: 2, 7: Physical properties; Phase at STP: gas: Melting point
Less reactive than iodine, astatine is the least reactive of the halogens; [51] the chemical properties of tennessine, the next-heavier group 17 element, have not yet been investigated, however. [52] Astatine compounds have been synthesized in nano-scale amounts and studied as intensively as possible before their radioactive disintegration. The ...