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SHELBY -Rubidium because it is an alkali metal, making it highly reactive. Also, it is lower on the periodic table than the other ones. 

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SHELBY -Rubidium because it is an alkali metal, making it highly reactive. Also, it is lower on the periodic table than the other ones. 

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Rubidium because it is lower on the periodic table making it more reactive. It also tends to form positive ions more readily than the other Alkaline metals.

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Rubidium would be the most reactive because it is furthest to the left and bottom of the periodic table.

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I would expect Rubidium to be the most reactive because it's an alkali metal and it's on the bottom of the periodic table.

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Rubidium because it has more electrons that are closer to the nucleus. 

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Rubidium because it has more electrons that are closer to the nucleus. 

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Rubidium is the most reactive because it is further down the periodic table.  (Annabel B.)

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Rubidium is the most reactive because it is further down the periodic table.  (Annabel B.)

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Lithium because it has the smallest radius, so more energy is required to pull the valence electrons from the atom itself. It also has the greatest electron affinity, so more energy is released when an electron is added.

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Lithium because it has the smallest radius, so more energy is required to pull the valence electrons from the atom itself. It also has the greatest electron affinity, so more energy is released when an electron is added.

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Lithium because it has the highest amount of ionization energy in the alkali metals group. Also, due to its lower atomic radius, then that makes it more attractive then the other elements.

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Rubidium because it has the largest electron cloud of the alkali metals listed, making it the most reactive out of the 4.

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Rubidium because it is further to the left

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Rubidium because it is further to the left

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Rubidium because it's further down on the list of alkali metals

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Rubidium because it's further down on the list of alkali metals

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Rubidium because it is lower on the periodic table which means that since it is farther down the group then it is going to be more reactive.

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Rubidium because it has more electron clouds than the other elements.

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Rubidium because it has more electron clouds than the other elements.

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Rubidium due to the fact that on top of it being a very reactive element in general (Alkali Metal), it also has a very low Ionization energy, which means it is readily avaliable to lose it's electron which means it will react very easily, especially to something with a high (more negative) affinity.

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Rubidium due to the fact that on top of it being a very reactive element in general (Alkali Metal), it also has a very low Ionization energy, which means it is readily avaliable to lose it's electron which means it will react very easily, especially to something with a high (more negative) affinity.

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I think its rubidium because it is part of the alkali metals, which are highly reactive, and is at the bottom of the table and has only one valence electron

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Rubidium because it has a small amount of valence electrons and which will make the atom small and it cannot an will not be able to hold that many electrons with a negative charge therefore making it very reactive. 

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Rubidium because it has a small amount of valence electrons and which will make the atom small and it cannot an will not be able to hold that many electrons with a negative charge therefore making it very reactive. 

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Rubidium because it is the farthest to the bottom of the table in the alkali metals group and only has one valence electron.

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Rubidium because it is the farthest to the bottom of the table in the alkali metals group and only has one valence electron.

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Rubidium because it is in alkali metals which are  highly reactive.

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Rubidium because it is in alkali metals which are  highly reactive.

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Rubidium would be the most reactive because it is the furthest down in the group and as you go down in a group the reactivity goes up.

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Rubidium because it has only one valence electron and is in a lower period than the other elements listed.

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Rubidium because it has only one valence electron and is in a lower period than the other elements listed.

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Rubidium because it has a large electron cloud, which makes it harder for the atom to hold on to an electron

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Rubidium because it has a large electron cloud, which makes it harder for the atom to hold on to an electron

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Rubidium, because it's in the alkali metals group, and it's also on the very bottom of the table.

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rubidium because it is the farthest to the bottom which means it would be more reactive

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rubidium because it is the farthest to the bottom which means it would be more reactive

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Rubidium because it has the smallest amount of valence electrons

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Rubidium because it has the smallest amount of valence electrons

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Rubidium because it is farther down in the Alkai metals and these metals are reactive already. It only has one valence electron on top of that.