Kesium tabi kaesium je apilese kemika pelu ami-idamo Cs ati nomba atomu 55.
Caesium, 55Cs |
| Caesium |
|---|
| Pípè | /ˈsiːziəm/ (SEE-zee-əm) |
|---|
| Ìhànsójú | silvery gold |
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| Ìwúwo átọ̀mù Ar, std(Cs) | 132.90545196(6)[1] |
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| Caesium ní orí tábìlì àyè |
|---|
|
| Nọ́mbà átọ̀mù (Z) | 55 |
|---|
| Ẹgbẹ́ | group 1: H and alkali metals |
|---|
| Àyè | àyè 6 |
|---|
| Àdìpọ̀ | Àdìpọ̀-s |
|---|
| Ẹ̀ka ẹ́límẹ́ntì | Alkali metal |
|---|
| Ìtò ẹ̀lẹ́ktrọ́nù | [Xe] 6s1 |
|---|
| Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 18, 8, 1 |
|---|
| Àwọn ohun ìní ara |
|---|
| Ìfarahàn at STP | solid |
|---|
| Ìgbà ìyọ́ | 301.59 K (28.44 °C, 83.19 °F) |
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| Ígbà ìhó | 944 K (671 °C, 1240 °F) |
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| Kíki (near r.t.) | 1.93 g/cm3 |
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| when liquid (at m.p.) | 1.843 g/cm3 |
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| Critical point | 1938 K, 9.4 MPa |
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| Heat of fusion | 2.09 kJ/mol |
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| Heat of | 63.9 kJ/mol |
|---|
| Molar heat capacity | 32.210 J/(mol·K) |
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pressure| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
|---|
| at T (K) | 418 | 469 | 534 | 623 | 750 | 940 |
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|
| Atomic properties |
|---|
| Oxidation states | −1, +1[2] Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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| Electronegativity | Pauling scale: 0.79 |
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| Atomic radius | empirical: 265 pm |
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| Covalent radius | 244±11 pm |
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| Van der Waals radius | 343 pm |
|---|
 Color lines in a spectral rangeSpectral lines of caesium |
| Other properties |
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| Natural occurrence | primordial |
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| Crystal structure | (bcc) |
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| Thermal expansion | 97 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 35.9 W/(m·K) |
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| Electrical resistivity | 205 Ω·m (at 20 °C) |
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| Magnetic ordering | paramagnetic[3] |
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| Young's modulus | 1.7 GPa |
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| Bulk modulus | 1.6 GPa |
|---|
| Mohs hardness | 0.2 |
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| Brinell hardness | 0.14 MPa |
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| CAS Number | 7440-46-2 |
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| Main isotopes of caesium |
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| Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
|---|
| 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 | 30.07 y | β− | 1.174 | 137Ba |
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| references |
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