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F-block Elements - The Actinoids

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Estimated time: 7 minutes
CBSE: Class 12
Maharashtra State Board: Class 12

Key Points: The Actinoids

Actinoids are the 14 elements from Th (90) to Lr (103). General configuration: [Rn] 5f¹⁻¹⁴ 6d⁰⁻² 7s²

Complete Actinoid Table:

 
Element Symbol Z E.C. Oxidation States M³⁺ radius (pm) M⁴⁺ radius (pm)
Actinium Ac 89 [Rn] 6d¹ 7s² +3 111
Thorium Th 90 [Rn] 6d² 7s² (+3), +4 99
Protactinium Pa 91 [Rn] 5f² 6d¹ 7s² +3, +4, +5 96
Uranium U 92 [Rn] 5f³ 6d¹ 7s² +3, +4, +5, +6 103 93
Neptunium Np 93 [Rn] 5f⁴ 6d¹ 7s² +3, +4, +5, +6, +7 101 92
Plutonium Pu 94 [Rn] 5f⁶ 7s² +3, +4, +5, +6, +7 100 90
Americium Am 95 [Rn] 5f⁷ 7s² +3, (+4), +5, +6 99 89
Curium Cm 96 [Rn] 5f⁷ 6d¹ 7s² +3, (+4) 99 88
Berkelium Bk 97 [Rn] 5f⁹ 7s² +3, +4 98 87
Californium Cf 98 [Rn] 5f¹⁰ 7s² +3 86
Einsteinium Es 99 [Rn] 5f¹¹ 7s² +3
Fermium Fm 100 [Rn] 5f¹² 7s² +3
Mendelevium Md 101 [Rn] 5f¹³ 7s² +3
Nobelium No 102 [Rn] 5f¹⁴ 7s² +3
Lawrencium Lr 103 [Rn] 5f¹⁴ 6d¹ 7s² +3

 

Shaalaa.com | D and F Block Elements part 32 (Actinoids)

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D and F Block Elements part 32 (Actinoids) [00:12:09]
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