The first element in the actinide series is actinium , a chemical element in the Periodic Table that has the symbol Ac and atomic number 89.
The actinide (or actinoid) series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table , with atomic numbers 89-103.
The actinides get their name from the first element in the series , actinium.
thorium. the first is actinium (atomic number 89), and the second is thorium (atomic number 90)
The element is Thorium (Th) with the atomic number 90.
Neptunium
Neptunium
Neptunium(Np)
Actinium (Ac)
Thorium
Fourth halogen
Thorium, atom no. 90, just after Actinium (89)
Thorium belongs to the actinides family that is found in row 7 of the periodic table. There are 15 elements in this family, including actinium, uranium, plutonium, neptunium, and lawrencium.
Uranium and Plutonium are the only elements from the Actinides series that occur naturally on Earth, though they are rare.
Neptunium is a member of the actinides group.
Elements. The Lanthanides are: Atomic No.575859606162636465666768697071NameLaCePrNdPmSmEuGdTbDyHoErTmYbLu The Actinides are:Atomic No.8990919293949596979899100101102103NameAcThPaUNpPuAmCmBkCfEsFmMdNoLr
Element groups
Thorium
Actinides family
The Actinides(Actinoids)
The other elements of the actinides group.
Plutonium is a member of the actinides group.
Americium is a member of the actinides group.
Americium is a member of the actinides group.
Lanthanides and Actinides probably
Actinium belongs to actinides. It has atomic no. 89
it is transition metal. ---- Actinides family
Curium is an artificial element, radioactive, unstable, metal , solid, a member of the actinides group.