Rubidium and strontium are both in Period 5 of the Periodic Table.
Rubidium is in Group I. Strontium is in Group II.
Which statement about these elements is correct?
1 )
Each element has five electrons in its outer electron shell.
2 )
The atomic number of rubidium is greater than the atomic number of strontium.
Rubidium forms the Rb$^+$ ion; strontium forms the Sr2$^+$ ion.
4 )
Electrolysis of molten rubidium chloride and of molten strontium chloride produces hydrogen.
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