Curium Element (Periodic Table)

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Curium

Curium (Cm) is a chemical element of the periodic table, located in the period 7, and has the atomic number 96. It is the eighth element in the actinide series. It is a hard, silvery-white metal which is named in honour of Marie and Pierre Curie. It is the fourth transuranium element and is counted as one of the radioactive elements.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
 1
H
 2
He
2
 3
Li
 4
Be
 5
B
 6
C
 7
N
 8
O
 9
F
 10
Ne
3
 11
Na
 12
Mg
 13
Al
 14
Si
 15
P
 16
S
 17
Cl
 18
Ar
4
 19
K
 20
Ca
 21
Sc
 22
Ti
 23
V
 24
Cr
 25
Mn
 26
Fe
 27
Co
 28
Ni
 29
Cu
 30
Zn
 31
Ga
 32
Ge
 33
As
 34
Se
 35
Br
 36
Kr
5
 37
Rb
 38
Sr
 39
Y
 40
Zr
 41
Nb
 42
Mo
 43
Tc
 44
Ru
 45
Rh
 46
Pd
 47
Ag
 48
Cd
 49
In
 50
Sn
 51
Sb
 52
Te
 53
I
 54
Xe
6
 55
Cs
 56
Ba
 72
Hf
 73
Ta
 74
W
 75
Re
 76
Os
 77
Ir
 78
Pt
 79
Au
 80
Hg
 81
Tl
 82
Pb
 83
Bi
 84
Po
 85
At
 86
Rn
7
 87
Fr
 88
Ra
 104
Rf
 105
Db
 106
Sg
 107
Bh
 108
Hs
 109
Mt
 110
Ds
 111
Rg
 112
Cn
 113
Nh
 114
Fl
 115
Mc
 116
Lv
 117
Ts
 118
Og
57
La
 58
Ce
 59
Pr
 60
Nd
 61
Pm
 62
Sm
 63
Eu
 64
Gd
 65
Tb
 66
Dy
 67
Ho
 68
Er
 69
Tm
 70
Yb
 71
Lu
89
Ac
 90
Th
 91
Pa
 92
U
 93
Np
 94
Pu
 95
Am
 96
Cm
 97
Bk
 98
Cf
 99
Es
 100
Fm
 101
Md
 102
No
 103
Lr
– f block

FAQs on Curium Element

Curium
‣ What does curium look like?

Appearance: silvery metallic, glows purple in the dark
‣ Who discovered curium and in what year?

Discovery: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso (1944)
‣ Where is curium found on the periodic table?

Curium Periodic Table

Location: Curium is found in the seventh row of the periodic table, next to the americium element.
‣ What is the atomic number of curium?

Atomic number (Z): 96
‣ What is the symbol of curium?

Symbol: Cm
‣ Curium atomic weight: [247]
‣ What block does curium belong to?

Block: f-block
‣ What period is curium in on the periodic table?

Period: 7
‣ Curium atomic radius: empirical: 174 pm
‣ Curium covalent radius: 169±3 pm
‣ Curium melting point: 1613 K (1340 °C, 2444 °F)
‣ What is curium boiling point?

Boiling point: 3383 K (3110 °C, 5630 °F)
‣ How many electron shells does curium have?

Electrons per shell: 2, 8, 18, 32, 25, 9, 2
‣ What is the electron configuration of curium?

Electron configuration: [Rn] 5f7 6d1 7s2
‣ Curium ionization energies:
1st: 581 kJ/mol
‣ What is the phase of curium?

Phase (at r.t): solid
‣ What is the density of the element curium?

Density (near r.t): 13.51 g/cm3
‣ Curium magnetic ordering: antiferromagnetic-paramagnetic transition at 52 K
‣ Curium natural occurrence: synthetic
‣ Curium oxidation state: +3
‣ What’s the electronegativity of curium?

Electronegativity: Pauling scale: 1.3
‣ Curium heat of fusion: 13.85 kJ/mol
‣ Curium crystal structure: double hexagonal close-packed (dhcp)
‣ Curium electrical resistivity: 1.25 µΩ.m
‣ Curium CAS number: 7440-51-9

‣ Curium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)17881982

‣ How many isotopes does curium have?

Main isotopes of curium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
242Cmsyn160 dSF
α		–
238Pu
243Cmsyn29.1 yα
ε
SF		239Pu
243Am
–
244Cmsyn18.1 ySF
α		–
240Pu
245Cmsyn8500 ySF
α		–
241Pu
246Cmsyn4730 yα
SF		242Pu
–
247Cmsyn1.56 × 107 yα243Pu
248Cmsyn3.40 × 105 yα
SF		244Pu
–
250Cmsyn9000 ySF
α
β–		–
246Pu
250Bk

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