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Who discovered neutrons?

I have the same number of protons, different number of neutrons. What am I?

Only one or two isotopes are stable.

C an be absorbed by a sheet of paper. Consists of 2 neutrons and 2 protons.

Stopped by 5mm of aluminium and has 1 electron.

Has no mass or charge and can be stopped by thick sheets of lead and multiple metres of concrete.

Overall rate of decay in isotopes.

Time taken for number of radioactive nuclei/activity to half.