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You would have to give me number to compare but I would say the one with the higher atomic number. The atomic number is the number of protons in the nucleus, so I would assume that the more protons an atom has, the more reactive it is. like with a magnet, if you have two or three magnets, they will be reactive, but if you have seven or eight, they will be much MORE reactive. Hope this helps!

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11y ago
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Anonymous

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3y ago
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14y ago

Atomic Mass is larger than atomic number , bcoz atomic number represents only number of proton in the atom , while the atomic mass represents number of proton and neutron both.

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13y ago

From what you've said, I can't tell what you're asking. Which atom has more (what)?

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11y ago

Helium atomic number 2 is the least reactive.

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Q: What atomic number is the least reactive?
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