Chemistry class 12th Properties_of_Actinium_and_Actinoids

Some Properties of Actinium and Actinoids


Property Actinium (Ac) Actinoids (Actinides)

Atomic Number 89 89-103 (Ac to Lr)

Symbol Ac Varies (e.g., Th, U, Pu)

Electronic Configuration [Rn] 6d1 7s2 Generally [Rn] 5f1-14 6d0-1 7s2

Block d-block f-block

Period 7 7

Group 3 Varies (Mainly f-block)

Oxidation States +3 (most stable) +3 to +7 (varies by element)

Density (g/cm³) 10.07 Varies (e.g., U: 19.05, Pu: 19.86)

Melting Point (°C) 1050 Varies (e.g., Th: 1750, U: 1132)

Boiling Point (°C) 3200 Varies (e.g., Th: 4790, U: 4131)

Radioactive? Yes Yes (all actinoids are radioactive)

Occurrence Rare, Found in Uranium ores Mostly synthetic, except Th, Pa, U

Common Uses Radiation source, nuclear
Nuclear
studies
reactors, weapons, medicine, power generation