Neptunium Element (Periodic Table)

Neptunium

Neptunium (Np) is a chemical element of the periodic table, located in the period 7, and has the atomic number 93. It is the fifth element in the actinide series. It is a silvery metal which is named after the planet Neptune. It is the first 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 Neptunium Element

Neptunium
‣ What does neptunium look like?

Appearance: silvery metallic
‣ Who discovered neptunium? When was the element neptunium discovered?

Discovery: Edwin McMillan and Phillip H. Abelson (1940)
‣ Location of neptunium on the periodic table

Neptunium Periodic Table

Location: Neptunium is found in the seventh row of the periodic table, next to the uranium element.
‣ What is neptunium atomic mass number?

Atomic number (Z): 93
‣ What’s the symbol for neptunium?

Symbol: Np
Neptunium atomic weight: [237]
‣ What block does neptunium belong to?

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

Period: 7
‣ What is the atomic radius of neptunium?

Atomic radius: empirical: 155 pm
Neptunium covalent radius: 190±1 pm
Neptunium melting point: 912±3 K (639±3 °C, 1182±5 °F)
Neptunium boiling point: 4447 K (4174 °C, 7545 °F) (extrapolated)
‣ How many electron shells does neptunium have?

Electrons per shell: 2, 8, 18, 32, 22, 9, 2
‣ What is the electron configuration of neptunium?

Electron configuration: [Rn] 5f4 6d1 7s2
Neptunium ionization energies:
1st: 604.5 kJ/mol
‣ Is neptunium a solid, liquid or gas?

Phase (at r.t): solid
Neptunium density (near r.t): alpha: 20.45 g/cm3
accepted standard value: 19.38 g/cm3
Neptunium magnetic ordering: paramagnetic
Neptunium natural occurrence: form decay
Neptunium oxidation state: +3, +4, +5, +6, +7
‣ What’s the electronegativity of neptunium?

Electronegativity: Pauling scale: 1.36
Neptunium heat of fusion: 5.19 kJ/mol
Neptunium heat of vaporization: 336 kJ/mol
Neptunium molar heat capacity: 29.46 J/(mol K)
‣ What is the crystal structure of neptunium?

Crystal structure: orthorhombic
Thermal conductivity of neptunium: 6.3 W/(m.K)
Neptunium electrical resistivity: 1.220 µΩ.m (at 22 °C)
Neptunium CAS number: 7439-99-8

‣ Neptunium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)21942437

‣ How many isotopes does neptunium have?

Main isotopes of neptunium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
235Npsyn396.1 dα
ε
231Pa
235U
236Npsyn1.54 × 105 yε
β
α
236U
236Pu
232Pa
237Nptrace2.144 × 106 yα233Pa
239Nptrace2.356 dβ239Pu

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