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