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SIMPLE MULTIPLE CHOICE PLEASE HELP!!!!!

1.) In the Geiger-Marsden experiment, a thin gold foil was bombarded by
electrons
alpha particles
gamma rays

2.) The chemical characteristics of an atom are determined by its:
atomic number
mass number
binding energy
number of isotopes

3.) Calculate the speed of the electron of a hydrogen atom if it is in the fifth circular orbit.
4.4 x 10^5
1.1 x 10^7

ANY HELP IS APPRECIATED!!!

Respuesta :

First one is alpha particles, second one I think is atomic number. Sorry I don´t know about the third.

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