Answer:
A. star formation begins in a nebula.
Explanation:
More similar to Cesium
Explanation:
The properties of Rubidium are more similar to those of cesium compared to strontium.
Elements in the same group on the periodic table have similar chemical properties.
- Rubidium and Cesium are located in the first group on the periodic table.
- Other elements in this group are lithium, sodium, potassium and francium
- Strontium belongs to the second group on the periodic table.
- The first group have a ns¹ valence shells electronic configuration.
- They are all referred to as alkali metals
Learn more:
Sodium brainly.com/question/6324347
Periodic table brainly.com/question/1704778
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It should remain constant because of the law of conservation of mass and because the flask is sealed no mass will escape