Samarium Element (Periodic Table)

Samarium

Samarium (Sm) is a chemical element of the periodic table, located in the period 6, and has the atomic number 62. It is the sixth element in the lanthanide series. It is a silvery-white metal, which is named after Colonel Samarsky, a Russian mine official. It is a highly reactive metal and is counted as one of the rare earth 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 Samarium Element

Samarium
‣ What does samarium look like?

Appearance: silvery white
‣ Who discovered samarium? When was samarium discovered?

Discovery and first isolation: Lecoq de Boisbaudran (1879)
‣ Where is samarium found on the periodic table?

Samarium Periodic Table

Location: Samarium is found in the sixth row of the periodic table, next to the promethium element.
‣ What is samarium atomic mass number?

Atomic number (Z): 62
‣ What’s the symbol for samarium?

Symbol: Sm
Samarium atomic weight: 150.36
‣ What block is samarium in the periodic table?

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

Period: 6
Samarium atomic radius: empirical: 180 pm
Samarium covalent radius: 198±8 pm
‣ What is samarium melting point?

Melting point: 1345 K (1072 °C, 1962 °F)
‣ What is samarium boiling point?

Boiling point: 2713 K (1900 °C, 3452 °F)
‣ How many shells does samarium have?

Electrons per shell: 2, 8, 18, 24, 8, 2
‣ What is the electron configuration of samarium?

Electron configuration: [Xe] 4f6 6s2
Samarium ionization energies:
1st: 544.5 kJ/mol
2nd: 1070 kJ/mol
3rd: 2260 kJ/mol
‣ What is the phase of samarium?

Phase (at r.t): solid
Samarium density (near r.t): 7.52 g/cm3
when liquid (at m.p): 7.16 g/cm3
Samarium magnetic ordering: paramagnetic
Samarium natural occurrence: primordial
‣ What is the oxidation state of samarium?

Oxidation state: +2, +3
‣ What’s the electronegativity of samarium?

Electronegativity: Pauling scale: 1.17
Samarium poisson’s ratio: α form: 0.274
Samarium heat of fusion: 8.62 kJ/mol
Samarium heat of vaporization: 192 kJ/mol
Samarium molar heat capacity: 29.54 J/(mol K)
Samarium molar magnetic susceptibility: +1860 × 10-6 cm3/mol (291 K)
Speed of sound in samarium: 2130 m/s (at 20 °C)
‣ What is the crystal structure of samarium?

Crystal structure: rhombohedral
Thermal expansion of samarium: (r.t) (α, poly) 12.7 µm/(m.K)
Thermal conductivity of samarium: 13.3 W/(m.K)
Samarium electrical resistivity: (r.t) (α, poly) 0.940 µΩ.m
‣ Samarium hardness

Vickers hardness: 410-440 MPa
Brinell hardness: 440-600 MPa
Young’s modulus of samarium: α form: 49.7 GPa
Shear modulus of samarium: α form: 19.5 GPa
Bulk modulus of samarium: α form: 37.8 GPa
Samarium CAS number: 7440-19-9

‣ Samarium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)100111061240(1421)(1675)(2061)

‣ How many isotopes does samarium have?

Main isotopes of samarium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
144Sm3.08 %stable
145Smsyn340 dε145Pm
146Smsyn6.8 × 107 yα142Nd
147Sm15.00 %1.06 × 1011 yα143Nd
148Sm11.25 %7 × 1015 yα144Nd
149Sm13.82 %stable
150Sm7.37 %stable
151Smsyn90 yβ151Eu
152Sm26.74 %stable
153Smsyn46.284 hβ153Eu
154Sm22.74 %stable

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