Rubidium is below potassium in Group I of the Periodic Table.
• The melting point of rubidium is …...1…... than that of potassium.
• The reaction of rubidium with water is ……2…… than that of potassium.
Which words correctly complete these statements?
1 )
1: higher / 2: faster
2 )
1: higher / 2: slower
1: lower / 2: faster
4 )
1: lower / 2: slower
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