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Calcium |
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Ìhànsójú | Dull gray, silver |
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Ìwúwo átọ̀mù Ar, std(Ca) | 40.078(4)[1] |
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Calcium ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 20 |
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Ẹgbẹ́ | group 2 (alkaline earth metals) |
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Àyè | àyè 4 |
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Àdìpọ̀ | Àdìpọ̀-s |
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Ẹ̀ka ẹ́límẹ́ntì | Alkaline earth metal |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Ar] 4s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 8, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 1115 K (842 °C, 1548 °F) |
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Ígbà ìhó | 1757 K (1484 °C, 2703 °F) |
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Kíki (near r.t.) | 1.55 g/cm3 |
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when liquid (at m.p.) | 1.378 g/cm3 |
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Heat of fusion | 8.54 kJ/mol |
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Heat of | 154.7 kJ/mol |
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Molar heat capacity | 25.929 J/(mol·K) |
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pressure
P (Pa)
|
1
|
10
|
100
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1 k
|
10 k
|
100 k
|
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at T (K)
|
864
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956
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1071
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1227
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1443
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1755
|
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Atomic properties |
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Oxidation states | +1,[2] +2 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 1.00 |
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energies | |
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Atomic radius | empirical: 197 pm |
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Covalent radius | 176±10 pm |
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Van der Waals radius | 231 pm |
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Spectral lines of calcium |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | (fcc) |
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Speed of sound thin rod | 3810 m/s (at 20 °C) |
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Thermal expansion | 22.3 µm/(m·K) (at 25 °C) |
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Thermal conductivity | 201 W/(m·K) |
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Electrical resistivity | 33.6 n Ω·m (at 20 °C) |
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Magnetic ordering | diamagnetic |
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Young's modulus | 20 GPa |
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Shear modulus | 7.4 GPa |
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Bulk modulus | 17 GPa |
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Poisson ratio | 0.31 |
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Mohs hardness | 1.75 |
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Brinell hardness | 167 MPa |
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CAS Number | 7440-70-2 |
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Main isotopes of calcium |
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Àdàkọ:Category-inline | references |