Americium Element (Periodic Table)

Americium

Americium (Am) is a chemical element of the periodic table, located in the period 7, and has the atomic number 95. It is the seventh element in the actinide series. It is a silvery-white metal which is named after America, where it was first made. It is the third transuranium element, highly toxic 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 Americium Element

Americium
‣ What does americium look like?

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

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

Americium Periodic Table

Location: Americium is found in the seventh row of the periodic table, next to the plutonium element.
‣ What is americium’s atomic number?

Atomic number (Z): 95
‣ What’s the symbol for americium?

Symbol: Am
Americium atomic weight: [243]
‣ What block is americium in the periodic table?

Block: f-block
‣ Period of americium in the periodic table

Period: 7
Americium atomic radius: empirical: 173 pm
Americium covalent radius: 180±6 pm
Americium melting point: 1449 K (1176 °C, 2149 °F)
Americium boiling point: 2880 K (2607 °C, 4725 °F) (calculated)
‣ How many electron shells does americium have?

Electrons per shell: 2, 8, 18, 32, 25, 8, 2
Americium electron configuration: [Rn] 5f7 7s2
Americium ionization energies:1st: 578 kJ/mol
‣ What is the phase of americium?

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

Density (near r.t): 12 g/cm3
Americium magnetic ordering: paramagnetic
Americium natural occurrence: synthetic
Americium oxidation state: +2, +3, +4, +5, +6
Americium electronegativity: Pauling scale: 1.3
Americium heat of fusion: 14.39 kJ/mol
Americium molar heat capacity: 28 J/(mol K)
Americium molar magnetic susceptibility: +1000.0 × 10-6 cm3/mol
Americium crystal structure: double hexagonal close-packed (dhcp)
Thermal conductivity of americium: 10 W/(m.K)
Americium electrical resistivity: 0.69 µΩ.m
Americium CAS number: 7440-35-9

‣ Americium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)12391356

‣ How many isotopes does americium have?

Main isotopes of americium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
241Amsyn432.2 ySF
α

237Np
242Amsyn141 yIT
α
SF
242Am
238Np
243Amsyn7370 ySF
α

239Np

.
.
.

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