All atoms of a given element have the same __________. A: mass B: number of protons C: number of neutrons D: number of electrons and neutrons E: density

Rutherford proposed ( ) by analyzing the results of the α particle scattering experiment A: Atomic nuclear structure model B: There are neutrons in the nucleus C: Electrons are part of atoms D: The nucleus is made up of protons and neutrons

X-rays are made up of ___. A: electrons B: protons C: photons D: Neutrons

以下属于直接电离辐射的是（） A: X-rays B: γ-rays C: β-rays D: neutrons

Atoms having the same atomic number Z, but different numbers of neutrons N are called of the element A: nuclei B: isotopes C: units D: masses

The atomic weight of an atom, or the molecular weight of a molecule, is its mass relative to that of a(n) ________ atom. This is essentially equal to the number of protons plus neutrons that the atom or molecule contains.

Nuclides<br/>with the same number of protons but different numbers of neutrons, we<br/>called them:() A: Isotope B: Isomer C: Stable nuclide D: Unstable nuclide