Lithium, sodium and potassium are elements in Group I.
Statements about these elements are listed.
1- Lithium is more dense than sodium.
2- Sodium is more reactive than potassium.
3- They all conduct electricity at room temperature.
4- They all react with oxygen at room temperature.
Which statements are correct?
1 )
1 and 2
2 )
1 and 4
3 )
2 and 3
3 and 4
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