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ନାମ, ପ୍ରତୀକ | barium, Ba |
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Appearance | silvery gray |
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ଉଚ୍ଚାରଣ | BAIR-ee-əm |
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ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 56 |
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ଶ୍ରେଣୀ, ବ୍ଳକ | group 2 (alkaline earth metals), s-block |
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ପର୍ଯ୍ୟାୟ | period 6 |
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ମୌଳିକ ପ୍ରକାର | alkaline earth metals |
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ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | 137.327 |
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ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 6s2 |
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per shell | 2, 8, 18, 18, 8, 2 |
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ଅବସ୍ଥା | solid |
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ଗଳନାଙ୍କ | 1000 K (727 °C, 1341 °F) |
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ସ୍ଫୁଟନାଙ୍କ | 2170 K (1897 °C, 3447 °F) |
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Density near r.t. | 3.51 g/cm3 |
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when liquid, at m.p. | 3.338 g/cm3 |
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Heat of fusion | 7.12 kJ/mol |
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Heat of | 140.3 kJ/mol |
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Molar heat capacity | 28.07 J/(mol·K) |
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pressure
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
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at T (K)
|
911
|
1038
|
1185
|
1388
|
1686
|
2170
| |
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Oxidation states | +2 strongly basic oxide |
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Electronegativity | Pauling scale: 0.89 |
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Atomic radius | empirical: 222 pm |
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Covalent radius | 215±11 pm |
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Van der Waals radius | 268 pm |
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Crystal structure | body-centered cubic (bcc) |
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Speed of sound thin rod | 1620 m/s (at 20 °C) |
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Thermal expansion | 20.6 µm/(m·K) (at 25 °C) |
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Thermal conductivity | 18.4 W/(m·K) |
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Electrical resistivity | 332 n Ω·m (at 20 °C) |
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Magnetic ordering | paramagnetic |
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Young's modulus | 13 GPa |
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Shear modulus | 4.9 GPa |
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Bulk modulus | 9.6 GPa |
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Mohs hardness | 1.25 |
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CAS Number | 7440-39-3 |
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ଆବିଷ୍କାର | Carl Wilhelm Scheele (1772) |
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First isolation | Humphry Davy (1808) |
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| references |