A Group 7 element is an element in periodic table group 7 (IUPAC style) in the periodic table, which consists of: A periodic table group is a vertical column in the periodic table of the chemical elements. ... In the periodic table of the elements, a period is a row of the table. ... A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the elements. ... General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7 , 4, d Density, Hardness 7470 kg/m3, 6. ... A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the elements. ... General Name, Symbol, Number technetium, Tc, 43 Chemical series Transition metals Group, Period, Block 7, 5, d Density, Hardness 11500 kg/m3, NA Appearance Silvery gray metallic Atomic properties Atomic mass [98] u Atomic radius (calc. ... A period 6 element is one of the chemical elements in the sixth row (or period) of the periodic table of the elements, including the Lanthanides. ... General Name, Symbol, Number Rhenium, Re, 75 Chemical series transition metals Group, Period, Block 7 (VIIB), 6, d Density, Hardness 21020 kg/m3, 7 Appearance grayish white Atomic properties Atomic weight 186. ... A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the elements. ... Known properties Name, Symbol, Number Bohrium, Bh, 107 Chemical series Transition metals Group, Period, Block 7, 7, d Appearance unknown; probably metallic, silvery white or gray Atomic weight [264] amu Electron configuration probably [Rn]5f14 6d5 7s2 e- s per energy level 2, 8, 18, 32, 32, 13, 2 State... A periodic table group is a vertical column in the periodic table of the chemical elements. ... The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization devoted to the advancement of chemistry. ... The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements. ...

• manganese (25)
• technetium (43)
• rhenium (75)
• bohrium (107)

All of these elements are classed in Group 7 because their valence shell holds four electrons. Technetium has no stable isotopes. Technetium, and promethium (61), are the only two such elements before polonium, after which no known element has a stable isotope. General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7 , 4, d Density, Hardness 7470 kg/m3, 6. ... General Name, Symbol, Number technetium, Tc, 43 Chemical series Transition metals Group, Period, Block 7, 5, d Density, Hardness 11500 kg/m3, NA Appearance Silvery gray metallic Atomic properties Atomic mass [98] u Atomic radius (calc. ... General Name, Symbol, Number Rhenium, Re, 75 Chemical series transition metals Group, Period, Block 7 (VIIB), 6, d Density, Hardness 21020 kg/m3, 7 Appearance grayish white Atomic properties Atomic weight 186. ... Known properties Name, Symbol, Number Bohrium, Bh, 107 Chemical series Transition metals Group, Period, Block 7, 7, d Appearance unknown; probably metallic, silvery white or gray Atomic weight [264] amu Electron configuration probably [Rn]5f14 6d5 7s2 e- s per energy level 2, 8, 18, 32, 32, 13, 2 State... The valence shell is the outermost shell of an atom, which contains the electrons most likely to account for the nature of any reactions involving the atom and of the bonding interactions it has with other atoms. ... General Name, Symbol, Number Promethium, Pm, 61 Chemical series Lanthanides Group, Period, Block _ , 6 , f Density, Hardness 7264 kg/m3, no data Appearance metallic Atomic properties Atomic weight 145 u Atomic radius (calc. ... General Name, Symbol, Number Polonium, Po, 84 Series Metalloids Group, Period, Block 6 (VIA), 6, p Density, Hardness 9196 kg/m3, no data Appearance silvery Atomic properties Atomic weight [209] u Atomic radius (calc. ...

Color coding for these atomic numbers: At room temperature, all are solid; red indicates item is synthetic and does not occur naturally. This article is in need of attention. ...