Thorium is a member of the actinoids family; it is also placed in the period 7 of the Periodic Table of Mendeleev.
Thorium is a member of the actinoids family.
Thorium is a member of the actinoids family; the atomic number is 90.
Thorium (Th) is a member of the actinoids family.
Thorium is a member of actinoids family.
Thorium is a member of the actinoids family.
Uranium and thorium are in the actinoids family.
Thorium has 90 protons.
Thorium, with the chemical symbol Th, is the chemical element with the atomic number 90.
Thorium: natural chemical element, metal, solid, radioactive, actinoids family, period 7, atomic number 90, used in breeder reactors, etc.
Thorium's atomic number is 90. Thus, thorium has 90 protons per atom. To be electrically neutral then, thorium must also have 90 electrons per atom.
+4 is the most common and the most stable oxidation number
Thorium is a member of the actinoids family and is placed in period 7.