Respuesta :

Answer:

Rb

Explanation:

This is because they are in the same group which means they share similar properties.

The correct answer is rubidium (Rb).

What do rubidium and cesium have in common?

This family consists of the elements lithium, sodium, potassium, rubidium, cesium, and francium (Li, Na, K, Rb, Cs, and Fr, respectively). Group one elements share common characteristics.

What are the physical and chemical properties of caesium?

It is silvery gold, soft, and ductile. It is the most electropositive and most alkaline element.

Learn more about properties of elements here :  brainly.com/question/738185

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