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Rb
Yes, both explode when you drop them in a pool. But unlike rubidium, cæsium melts under body heat and is yellow.
Magnesium, strontium , and barium belong to group 2A of the periodic table. These have two valence electrons in their outermost shell. So these three elements have similar chemical properties. But the other given elements do not lie in same group so they have different chemical properties.
To the Group I of the Periodic Table of the (Chemical) Elements. Those elements are: H, Li, Na, K, Rb, Cs, Fr.
Any element in the alkali metal group would have similar chemical properties, for example they all react easily to water.
Rb
Yes, both explode when you drop them in a pool. But unlike rubidium, cæsium melts under body heat and is yellow.
It is helpful to organize things by characteristics because you can tell that certain elements are similar. For example if you knew nothing about the chemical or physical properties of (Rb) Rubidium, you could guess it has properties similar to (Cs) Cesium since they are in the same group. The common "Periodic Table" has many interesting forms. Search: "periodic table"
Magnesium, strontium , and barium belong to group 2A of the periodic table. These have two valence electrons in their outermost shell. So these three elements have similar chemical properties. But the other given elements do not lie in same group so they have different chemical properties.
Rubidium (Rb) is an alkali metal.
To the Group I of the Periodic Table of the (Chemical) Elements. Those elements are: H, Li, Na, K, Rb, Cs, Fr.
Potassium is a group 1/IA element, which is the alkali metals, so it shares characteristics with the rest of the elements in the group.
Any element in the alkali metal group would have similar chemical properties, for example they all react easily to water.
Lithium has similar properties with anything in Group 1 on the periodic table.
Rb is the symbol for the element, rubidium.
Rubidium (Rb) can react with many things such as hydrogen because rubidium has one spare electron 2, 8, 18, 8, 1 and hydrogen has only one outer electron so hydrogen in water will reactvigorously with rubidium as hydrogen is desperate to gain one electron and rubidium is desperate to lose one electron and when these bond they form an ion.
Lots of gems might contain those as minor impurities. You'd need to be significantly more specific.