Strontium Element (Periodic Table)

Strontium

Strontium (Sr) is a chemical element of the periodic table, located in the group 2 and the period 5, and has the atomic number 38. It is a soft, silvery-white yellowish alkaline earth metal, whose name comes from Strontian, a small town in Scotland. It is a highly reactive metal that reacts with both air and water.

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
– s block

FAQs on Strontium Element

Strontium
‣ What does strontium look like?

Appearance: silvery white metallic; with a pale yellow tint
‣ Who discovered strontium?

Discovery: William Cruickshank (1787)
First isolation: Humphry Davy (1808)
‣ Where is strontium found on the periodic table?

Strontium Periodic Table

Location: Strontium is found in the second column of the periodic table, next to the rubidium element.
‣ What is strontium’s atomic number?

Atomic number (Z): 38
‣ What is the symbol of strontium?

Symbol: Sr
‣ What is the atomic weight for strontium?

Standard atomic weight: 87.62
‣ What is the block of strontium?

Block: s-block
‣ What group does strontium belong to?

Group: 2 (alkaline earth metals)
‣ What period is strontium in on the periodic table?

Period: 5
‣ What is the atomic radius of strontium?

Atomic radius: empirical: 215 pm
Strontium covalent radius: 195±10 pm
Strontium Van der Waals radius: 249 pm
‣ What is the melting point of strontium?

Melting point: 1050 K (777 °C, 1431 °F)
Strontium boiling point: 1650 K (1377 °C, 2511 °F)
‣ How many electron shells does strontium have?

Electrons per shell: 2, 8, 18, 8, 2
‣ What is strontium electron configuration?

Electron configuration: [Kr] 5s2
‣ What is strontium ionization energy?

Ionization energies:
1st: 549.5 kJ/mol
2nd: 1064.2 kJ/mol
3rd: 4138 kJ/mol
‣ What is the phase of strontium?

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

Density (near r.t): 2.64 g/cm3
when liquid (at m.p): 2.375 g/cm3
Strontium magnetic ordering: paramagnetic
Strontium natural occurrence: primordial
Oxidation state of strontium: +2
‣ What’s the electronegativity of strontium?

Electronegativity: Pauling scale: 0.95
Strontium poisson’s ratio: 0.28
Strontium heat of fusion: 7.43 kJ/mol
Strontium heat of vaporization: 141 kJ/mol
Strontium molar heat capacity: 26.4 J/(mol K)
Strontium molar magnetic susceptibility: -92.0 × 10-6 cm3/mol (298 K)
‣ What is the crystal structure of strontium?

Crystal structure: face-centered cubic (fcc)
Thermal expansion of strontium: 22.5 µm/(m.K) (at 25 °C)
Thermal conductivity of strontium: 35.4 W/(m.K)
Strontium electrical resistivity: 132 nΩ.m (at 20 °C)
‣ What is the hardness of strontium?

Mohs hardness: 1.5
Young’s modulus of strontium: 15.7 GPa
Shear modulus of strontium: 6.03 GPa
Strontium CAS number: 7440-24-6

‣ Strontium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)796882990113913451646

‣ How many isotopes does strontium have?

Main isotopes of strontium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
82Srsyn25.36 dε82Rb
83Srsyn1.35 dε
β+
γ
83Rb
83Rb
84Sr0.56 %stable
85Srsyn64.84 dε
γ
85Rb
86Sr9.86 %stable
87Sr7.00 %stable
88Sr82.58 %stable
89Srsyn50.52 dε
β
89Rb
89Y
90Srtrace28.90 yβ90Y

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