ଛାଞ୍ଚ:Infobox Caesium

Caesium,  ₅₅Cs

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	caesium, Cs
Appearance	silvery gold
ଉଚ୍ଚାରଣ	/ˈsiːziəm/ SEE-zee-əm
Caesium in the periodic table
Rb ↑ Cs ↓ Fr xenon ← caesium → barium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	55
ଶ୍ରେଣୀ, ବ୍ଳକ	group 1 (alkali metals), s-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	alkali metal
ମାନକ ପରମାଣବିକ ଓଜନ (±) (Ar)	132.9054519(2)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 6s1
per shell	2, 8, 18, 18, 8, 1
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	301.59 K ​(28.44 °C, ​83.19 °F)
ସ୍ଫୁଟନାଙ୍କ	944 K ​(671 °C, ​1240 °F)
Density near r.t.	1.93 g/cm3
when liquid, at m.p.	1.843 g/cm3
Critical point	1938 K, 9.4 MPa
Heat of fusion	2.09 kJ/mol
Heat of	63.9 kJ/mol
Molar heat capacity	32.210 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 418 469 534 623 750 940
Atomic properties
Oxidation states	1 (strongly basic oxide)
Electronegativity	Pauling scale: 0.79
Atomic radius	empirical: 265 pm
Covalent radius	244±11 pm
Van der Waals radius	343 pm
Miscellanea
Crystal structure	​body-centered cubic (bcc)
Thermal expansion	97 µm/(m·K) (at 25 °C)
Thermal conductivity	35.9 W/(m·K)
Electrical resistivity	205 n Ω·m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	1.7 GPa
Bulk modulus	1.6 GPa
Mohs hardness	0.2
Brinell hardness	0.14 MPa
CAS Number	7440-46-2
ଇତିହାସ
ଆବିଷ୍କାର	Robert Bunsen and Gustav Kirchhoff (1860)
First isolation	Carl Setterberg (1882)
Most stable isotopes of caesium
iso NA half-life DM DE (MeV) DP 133Cs 100% 133Cs is stable with 78 neutrons 134Cs syn 2.0648 y ε 1.229 134Xe β− 2.059 134Ba 135Cs trace 2.3×106 y β− 0.269 135Ba 137Cs trace 30.17 y β− 1.174 137Ba

References

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