Atomic No.	Name	Symbol
89	Actinium	Ac
90	Thorium	Th
91	Protactinium	Pa
92	Uranium	U
93	Neptunium	Np
94	Plutonium	Pu
95	Americium	Am
96	Curium	Cm
97	Berkelium	Bk
98	Californium	Cf
99	Einsteinium	Es
100	Fermium	Fm
101	Mendelevium	Md
102	Nobelium	No
103	Lawrencium	Lr

The actinide series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table with atomic numbers 89 - 103. The actinide series is named after actinium. All actinides are f-block elements except lawrencium. There are also alternative arrangements which do not include either actinium or lawrencium in the actinide series.

The actinides display less similarity in their chemical properties than the lanthanide series, for instance exhibiting a wider range of oxidation states, which initially led to confusion as to whether actinium, thorium and uranium should be considered d-block elements. All actinides are radioactive.

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@Zoe_Walton There's not much emphasis on the lanthanides and actinides at the lower levels? #freerice #periodictable #relevanttomyinterests
sarahhazelton (Sarah Hazelton) Wed, 04 Nov 2009 12:15:48 -0000
@Zoe_Walton There's not much emphasis on the lanthanides and actinides at the lower levels? #freerice #periodictable #relevanttomyinterests
Actinides: [Rn](n-2)f^(Atomic # - 88) ns^2 or [Rn](n-2)f^(Atomic # - 87) (n - 1)d^1 ns^2 ... This is what chemistry has done to me. T_T
Histri_Juxta_Q (QQ) Tue, 03 Nov 2009 03:38:42 -0000
Actinides: [Rn](n-2)f^(Atomic # - 88) ns^2 or [Rn](n-2)f^(Atomic # - 87) (n - 1)d^1 ns^2 ... This is what chemistry has done to me. T_T

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