Radium is a radioactive element in the periodic table discorvered in 1898. It exhibits isotopy and belongs to a very reactive group of metals. Radium is chemically unstable.
288
88
226
26
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700° C
620° C
570° 570° 570° C
470° C
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3
5
6
7
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Alkali earth metals
Alkali metals
Alkali and alkali earth metals
Metalloids
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Gold
Silvery white
Blue
Green
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770°C
570°C
800°C
1737°C
1
2
4
5
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S
P
D
F
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Chlorine
Carbon
Nitrogen
Oxygen
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