The table shows some properties of the Group I metals.
What are the properties of rubidium?
melts below 63°C, very soft, reacts explosively with water
2 )
melts below 63°C, very soft, reacts slowly with water
3 )
melts above 181°C, very soft, reacts explosively with water
4 )
melts above 181°C, very soft, reacts slowly with water
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