A Group 4 element is an element in periodic table group 4 (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 Titanium, Ti, 22 Chemical series transition metals Group, Period, Block 4, 4, d Density, Hardness 4507 kg/m3, 6 Appearance Silvery metallic Atomic properties Atomic weight 47. ... 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 Zirconium, Zr, 40 Chemical series transition metals Group, Period, Block 4, 5, d Density, Hardness 6511 kg/m3, 5 Appearance Silvery white Atomic properties Atomic weight 91. ... 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 Hafnium, Hf, 72 Chemical series Transition metals Group, Period, Block 4 (IVB), 6, d Density, Hardness 13310 kg/m3, 5. ... 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 Rutherfordium, Rf, 104 Chemical series Transition metals Group, Period, Block 4, 7 , d Appearance unknown Atomic weight [261] amu Electron configuration probably [Rn]5f14 6d2 7s2 e- s per energy level 2,8,18,32,32,10,2 State of matter Presumably a solid Rutherfordium... 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. ...

• titanium (22)
• zirconium (40)
• hafnium (72)
• rutherfordium (104)

All of these elements are classed in Group 4 because their valence shell holds four electrons. Rutherfordium can only be produced in the laboratory and has not been found in nature. General Name, Symbol, Number Titanium, Ti, 22 Chemical series transition metals Group, Period, Block 4, 4, d Density, Hardness 4507 kg/m3, 6 Appearance Silvery metallic Atomic properties Atomic weight 47. ... General Name, Symbol, Number Zirconium, Zr, 40 Chemical series transition metals Group, Period, Block 4, 5, d Density, Hardness 6511 kg/m3, 5 Appearance Silvery white Atomic properties Atomic weight 91. ... General Name, Symbol, Number Hafnium, Hf, 72 Chemical series Transition metals Group, Period, Block 4 (IVB), 6, d Density, Hardness 13310 kg/m3, 5. ... Known properties Name, Symbol, Number Rutherfordium, Rf, 104 Chemical series Transition metals Group, Period, Block 4, 7 , d Appearance unknown Atomic weight [261] amu Electron configuration probably [Rn]5f14 6d2 7s2 e- s per energy level 2,8,18,32,32,10,2 State of matter Presumably a solid Rutherfordium... 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. ...

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. ...