Which pair of elements are the most different

After a radioactive atom decays, it is the same element that it was before with no measurable change in mass. the decay that is present is gamma decay because gamma decay has photons which has no mass unlike alpha and beta decay.

A atom has a mass of approximately 1 amu.

Hope this helps! :D

Please follow my friends user on roblox stephanieb87, PriscillaR_78

~Hope For The Dinos