Radium (Óa-im: "la-jí-ùm") sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 88, hoà-ha̍k hû-hō sī Ra.
Radium, 88Ra |
Ki-pún sèng-chit |
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Miâ, hû-hō | radium, Ra |
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Gōa-hêng | silvery white metallic |
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Radium tī chiu-kî-piáu lāi ê ūi-tì |
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Goân-chú-hoan | 88 |
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Goân-chú-liōng | (226) |
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Goân-sò͘ lūi-pia̍t | kiⁿ-thó͘ kim-sio̍k |
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Cho̍k, hun-khu | 2 cho̍k, s khu |
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Chiu-kî | tē 7 chiu-kî |
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Tiān-chú pâi-lia̍t | [Rn] 7s2 |
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per shell | 2, 8, 18, 32, 18, 8, 2 |
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Bu̍t-lí sèng-chit |
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Siòng | kò͘-thé |
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Iûⁿ-tiám | 973 K (700 °C, 1292 °F) (disputed) |
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Hut-tiám | 2010 K (1737 °C, 3159 °F) |
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Bi̍t-tō͘ (sek-un) | 5.5 g·cm−3 |
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Iûⁿ-hoà-jia̍t | 8.5 kJ·mol−1 |
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Cheng-hoat-jia̍t | 113 kJ·mol−1 |
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cheng-khì-apP (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k | tī T (K) | 819 | 906 | 1037 | 1209 | 1446 | 1799 |
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Goân-chú sèng-chit |
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Sng-hòa-sò͘ | 2 (expected to have a strongly basic oxide) |
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Tiān-hū-tō͘ | Pauling scale: 0.9 |
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Tiān-lī-lêng | 1st: 509.3 kJ·mol−1 2nd: 979.0 kJ·mol−1 |
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Kiōng-kè pòaⁿ-kèng | 221±2 pm |
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Van der Waals pòaⁿ-kèng | 283 pm |
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Cha̍p-lio̍k |
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Chiⁿ-thé kò͘-chō | body-centered cubic (bcc) |
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Jia̍t-thoân-tō-lu̍t | 18.6 W·m−1·K−1 |
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Tiān-chó͘-lu̍t | 1 µΩ·m (at 20 °C) |
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Chû-sèng | nonmagnetic |
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CAS teng-kì pian-hō | 7440-14-4 |
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Le̍k-sú |
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Hoat-hiān | Pierre Curie and Marie Curie (1898) |
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Siōng chá hû-lî | Marie Curie (1910) |
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Chòe ún-tēng ê tông-ūi-sò͘ |
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Chú bûn-chiong: radium ê tông-ūi-sò͘ |
iso | NA | half-life | DM | DE (MeV) | DP |
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223Ra | trace | 11.43 d | α | 5.99 | 219Rn | 224Ra | trace | 3.6319 d | α | 5.789 | 220Rn | 225Ra | trace | 14.9 d | β− | 0.356 | 225Ac | 226Ra | trace | 1600 y | α | 4.871 | 222Rn | 228Ra | trace | 5.75 y | β− | 0.046 | 228Ac |
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Chham-khó