A Group 3 element is an element in periodic table group 3 (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 scandium, Sc, 21 Chemical series transition metals Group, Period, Block 3, 4 , d Density, Hardness 2985 kg/m3, U/K Appearance Silvery white Atomic properties Atomic weight 44. ... A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the elements. ... Full table General Name, Symbol, Number Yttrium, Y, 39 Chemical series transition metals Group, Period, Block 3 (IIIB), 5, d Density, Hardness 4472 kg/m3, __ Appearance Silvery white Atomic Properties Atomic weight 88. ... The lanthanide series is the 14 rare earth chemical elements which lie between lanthanum and ytterbium on the periodic table. ... The actinide series encompasses the 14 chemical elements that lie between actinium and nobelium on the periodic table with atomic numbers 89 - 102 inclusive. ... 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. ...

• scandium (21)

• yttrium (39)

• lanthanum (57) - lutetium (71)

• actinium (89) - lawrencium (103)

All of these elements are classed in Group 3 because their outer shell holds three electrons. Scandium, yttrium, and the lanthanides (except promethium) can all be found naturally, albeit at very low levels in the Earth's crust, and are collectively called rare-earth metals. Promethium (61) and neptunium (93) through lawrencium can only be produced in the laboratory and have not been found in nature. General Name, Symbol, Number scandium, Sc, 21 Chemical series transition metals Group, Period, Block 3, 4 , d Density, Hardness 2985 kg/m3, U/K Appearance Silvery white Atomic properties Atomic weight 44. ... Full table General Name, Symbol, Number Yttrium, Y, 39 Chemical series transition metals Group, Period, Block 3 (IIIB), 5, d Density, Hardness 4472 kg/m3, __ Appearance Silvery white Atomic Properties Atomic weight 88. ... General Name, Symbol, Number Lanthanum, La, 57 Chemical series Lanthanides Group, Period, Block 3 , 6 , f Density, Hardness 6146 kg/m3, 2. ... General Name, Symbol, Number Lutetium, Lu, 71 Chemical series Transition metals Group, Period, Block 3, 6 , d Density, Hardness 9841 kg/m3, __ Appearance Silvery white Atomic properties Atomic weight 174. ... General Name, Symbol, Number actinium, Ac, 89 Chemical series Actinides Group, Period, Block 3 , 7, f Density, Hardness 10070 kg/m3, n/a Appearance silvery Atomic properties Atomic weight (227) u Atomic radius (calc. ... Known properties Name, Symbol, Number lawrencium, Lr, 103 Chemical series Transition metals Group, Period, Block 3, 7 , d Appearance unknown; probably metallic, silvery white or gray Atomic weight [ 262 ] amu Electron configuration probably [Rn]5f14 7s2 7p1 e- s per energy level 2, 8, 18, 32, 32, 9, 2 State... The lanthanide series is the 14 rare earth chemical elements which lie between lanthanum and ytterbium on the periodic table. ... Earth, also known as the Earth or Terra, is the third planet outward from the Sun. ... A rare earth is an oxide of a rare earth element. ... 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 Neptunium, Np, 93 Chemical series Actinides Period, Block 7 , f Density, Hardness 20250 kg/m3, n/a Appearance Silvery metallic Atomic properties Atomic weight [237] 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. ... The lanthanide series is the 14 rare earth chemical elements which lie between lanthanum and ytterbium on the periodic table. ... The actinide series encompasses the 14 chemical elements that lie between actinium and nobelium on the periodic table with atomic numbers 89 - 102 inclusive. ...

External link

http://www.iupac.org/reports/periodic_table/index.html