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An elements reactivity is based on how many electrons are in the valence shell. All elements try to get 8 electrons in there valence shell except hydrogen which can only have two. An element reacts with other elements by gaining or giving an electron and that process of giving or gaining causes the reaction.

Elements on the far left are most reactive because they only have one electron.

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13y ago

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The reactivity of an element can be determined by its position in the Periodic Table. Elements in Group 1 and 2 are highly reactive, while noble gases are inert. Reactivity also depends on the ability of an element to gain or lose electrons to achieve a stable electron configuration.

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AnswerBot

11mo ago
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Francium..

Mr King (akak Merlin the alien)

Kingsdown School

which is the most active element?

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Wiki User

13y ago
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To determine if an element is reactive or not you must test it.

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Wiki User

8y ago
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Any element with more than 83 protons or atomic #

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Wiki User

12y ago
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If it was one element and if you pur something on it or put something on it turns inti another thing

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Wiki User

15y ago
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You have to know what 1+1 is.

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Wiki User

12y ago
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Q: How do you know how reactive an element is?
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