Radiomu
Chemical element with atomic number 88Àdàkọ:SHORTDESC:Chemical element with atomic number 88
Radium, 88Ra| Radium |
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| Pípè | /ˈreɪdiəm/ (RAY-dee-əm) |
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| Ìhànsójú | silvery white metallic |
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| nọ́mbà ìsújọ | [226] |
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| Radium ní orí tábìlì àyè |
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|
|
| Nọ́mbà átọ̀mù (Z) | 88 |
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| Ẹgbẹ́ | group 2 (alkaline earth metals) |
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| Àyè | àyè 7 |
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| Àdìpọ̀ | Àdìpọ̀-s |
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| Ẹ̀ka ẹ́límẹ́ntì | Alkaline earth metal |
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| Ìtò ẹ̀lẹ́ktrọ́nù | [Rn] 7s2 |
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| Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 18, 8, 2 |
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| Àwọn ohun ìní ara |
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| Ìfarahàn at STP | solid |
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| Ìgbà ìyọ́ | 973 K (700 °C, 1292 °F) |
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| Ígbà ìhó | 2010 K (1737 °C, 3159 °F) |
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| Kíki (near r.t.) | 5.5 g/cm3 |
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| Heat of fusion | 8.5 kJ/mol |
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| Heat of | 113 kJ/mol |
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pressure
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
819
|
906
|
1037
|
1209
|
1446
|
1799
|
|
| Atomic properties |
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| Oxidation states | +2 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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| Electronegativity | Pauling scale: 0.9 |
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| Covalent radius | 221±2 pm |
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| Van der Waals radius | 283 pm |
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 Color lines in a spectral rangeSpectral lines of radium |
| Other properties |
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| Natural occurrence | from decay |
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| Crystal structure | (bcc) |
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| Thermal conductivity | 18.6 W/(m·K) |
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| Electrical resistivity | 1 µ Ω·m (at 20 °C) |
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| Magnetic ordering | nonmagnetic |
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| CAS Number | 7440-14-4 |
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| Main isotopes of radium |
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| Isotope
|
Abundance
|
Half-life (t1/2)
|
Decay mode
|
Product
|
| 223Ra
|
trace
|
11.43 d
|
alpha
|
5.99
|
219Rn
|
| 224Ra
|
trace
|
3.6319 d
|
alpha
|
5.789
|
220Rn
|
| 226Ra
|
~100%
|
1602 y
|
alpha
|
4.871
|
222Rn
|
| 228Ra
|
trace
|
5.75 y
|
beta−
|
0.046
|
228Ac
| |
Àdàkọ:Category-inline
| references |
Rédíọ́mù (pípè /ˈradiəmu/, RAY-dee-əm) jẹ́ ìpilẹ̀ṣẹ̀ kẹ́míkà tó ní àmì-ìdímọ̀ Ra àti nọ́ḿbà átọ̀mù 88.
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