Promethium Element (Periodic Table)

Promethium

Promethium (Pm) is a chemical element of the periodic table, located in the period 6, and has the atomic number 61. It is the fifth element in the lanthanide series. It is a silvery-white metal that glows in the dark with a pale blue or green light. It is named after Prometheus, a Titan god of fire, in Greek mythology, who stole fire from the Gods and gave it to humans. It is a rare earth element that is not available freely in nature 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 Promethium Element

Promethium
‣ What does promethium look like?

Appearance: metallic
‣ Who discovered promethium? When was the element promethium discovered?

Discovery: Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin (1945)
‣ Where is promethium located on the periodic table?

Promethium Periodic Table

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

Atomic number (Z): 61
Promethium symbol: Pm
Promethium atomic weight: [145]
‣ What block is promethium in the periodic table?

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

Period: 6
‣ What is the atomic radius of promethium?

Atomic radius: empirical: 183 pm
Promethium covalent radius: 199 pm
‣ What is melting point of promethium?

Melting point: 1315 K (1042 °C, 1908 °F)
‣ What is promethium boiling point?

Boiling point: 3273 K (3000 °C, 5432 °F)
‣ How many electron shells does promethium have?

Electrons per shell: 2, 8, 18, 23, 8, 2
Electron configuration of promethium: [Xe] 4f5 6s2
Promethium ionization energies:
1st: 540 kJ/mol
2nd: 1050 kJ/mol
3rd: 2150 kJ/mol
‣ What is the phase of promethium?

Phase (at r.t): solid
Promethium density (near r.t): 7.26 g/cm3
Promethium magnetic ordering: paramagnetic
Promethium natural occurrence: primordial
Promethium oxidation state: +3
‣ What is the electronegativity of promethium?

Electronegativity: Pauling scale: 1.13
Promethium poisson’s ratio: α form: est. 0.28
Promethium heat of fusion: 7.13 kJ/mol
Promethium heat of vaporization: 289 kJ/mol
‣ What is the crystal structure of promethium?

Crystal structure: double hexagonal close-packed (dhcp)
Thermal expansion of promethium: 9.0 µm/(m.K) (at r.t)
Thermal conductivity of promethium: 17.9 W/(m.K)
Promethium electrical resistivity: est. 0.75 µΩ.m (at r.t)
Young’s modulus of promethium: α form: est. 46 GPa
Shear modulus of promethium: α form: est. 18 GPa
Bulk modulus of promethium: α form: est. 33 GPa
Promethium CAS number: 7440-12-2

‣ How many isotopes does promethium have?

Main isotopes of promethium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
145Pmtrace17.7 yε145Nd
146Pmsyn5.53 yε
β
146Nd
146Sm
147Pmtrace2.6234 yβ147Sm

.
.
.

Related:

Also Read:

Leave a Comment