Calcium Element (Periodic Table)

Calcium

Calcium (Ca) is a chemical element of the periodic table, located in the group 2 and the period 4, and is having the atomic number 20. It is a soft, silvery-white alkaline earth metal, whose name comes from the Latin word “calx”, which means lime. It is the fifth most abundant element on earth.

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 Calcium Element

Calcium
‣ What is the appearance of calcium?

Appearance: dull gray, silver; with a pale yellow tint
‣ When was calcium discovered and by whom?

Discovery and first isolation: Humphry Davy (1808)
‣ Where is calcium located on the periodic table?

Calcium Periodic Table

Location: Calcium is found in the second column of the periodic table, next to the potassium element.
‣ What is calcium’s atomic number?

Atomic number (Z): 20
‣ What is calcium’s symbol?

Symbol: Ca
‣ What is the atomic weight of calcium?

Standard atomic weight: 40.078
‣ What block is calcium in the periodic table?

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

Group: 2 (alkaline earth metals)
‣ What period does calcium belong in the periodic table?

Period: 4
‣ What is calcium’s atomic radius?

Atomic radius: empirical: 197 pm
Covalent radius of calcium: 176±10 pm
Calcium Van der Waals radius: 231 pm
‣ What is calcium’s melting point?

Melting point: 1115 K (842 °C, 1548 °F)
‣ What is calcium’s boiling point?

Boiling point: 1757 K (1484 °C, 2703 °F)
‣ How many electrons shells does calcium have?

Electrons per shell: 2, 8, 8, 2
‣ What is calcium’s electron configuration?

Electron configuration: [Ar] 4s2
‣ What is calcium ionization energy?

Ionization energies:
1st: 598.8 kJ/mol
2nd: 1145.4 kJ/mol
3rd: 4912.4 kJ/mol
‣ Is calcium solid at room temperature?

Phase (at r.t): solid
‣ What is calcium’s density?

Density (near r.t): 1.55 g/cm3
when liquid (at m.p): 1.378 g/cm3
Calcium magnetic ordering: diamagnetic
Calcium natural occurrence: primordial
‣ What is the oxidation state of calcium?

Oxidation state: +2
‣ What is the electronegativity of calcium?

Electronegativity: Pauling scale: 1.00
Calcium poisson’s ratio: 0.31
Calcium heat of fusion: 8.54 kJ/mol
Calcium heat of vaporization: 154.7 kJ/mol
Calcium molar heat capacity: 25.929 J/(mol K)
Calcium molar magnetic susceptibility: +40.0 × 10-6 cm3/mol
Speed of sound in calcium: 3810 m/s (at 20 °C)
‣ What is the structure of calcium?

Crystal structure: face-centered cubic (fcc)
Thermal expansion of calcium: 22.3 µm/(m.K) (at 25 °C)
Thermal conductivity of calcium: 201 W/(m.K)
Calcium electrical resistivity: 33.6 nΩ.m (at 20 °C)
‣ What is the hardness of calcium?

Mohs hardness: 1.75
Brinell hardness: 170-416 MPa
Young’s modulus of calcium: 20 GPa
Shear modulus of calcium: 7.4 GPa
Bulk modulus of calcium: 17 GPa
Calcium CAS number: 7440-70-2

‣ Calcium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)8649561071122714431755

‣ How many isotopes does calcium have?

Main isotopes of calcium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
40Ca96.941 %stable
41Catrace9.94 × 104 yε41K
42Ca0.647 %stable
43Ca0.135 %stable
44Ca2.086 %stable
45Casyn162.6 dβ45Sc
46Ca0.004 %stable
47Casyn4.5 dβ
γ
47Sc
48Ca0.187 %6.4 × 1019 yββ48Ti

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