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19 July, 05:08

What determines the reactivity of an element?

The number of protons in the nucleus

The number of electrons in the outer energy level

The number of electrons in the innermost energy level

The number of neutrons in the nucleus

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  1. 19 July, 05:23
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    The number of electrons in the outer energy level, as this effects how many electrons have to be gained or lost in order to have a full outermost level
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