A) 3 B) 1 C) 2 D) 4
A) neutron B) proton C) electron D) element
A) element B) neutron C) electron D) proton
A) electron B) element C) neutron D) proton
A) nucleus B) heart of the atom C) electron cloud D) neutron
A) both positive and negative B) negative C) neutral (no charge) D) positive
A) negative B) both positive and negative C) positive D) neutral
A) electron cloud B) heart of the atom C) both the nucleus and the electron cloud D) nucleus
A) Dalton B) Bohr C) Thomson D) Chadwick
A) Democritus B) Dalton C) Rutherford D) Thomson
A) Rutherford B) Democritus C) Thomson D) Dalton |