Exploring the Atom: Structure and History

Which subatomic particle has a positive charge?

• Electron

• Proton

• Neutron

• Positron

Who discovered the electron?

• Ernest Rutherford

• J.J. Thomson

• Niels Bohr

• James Chadwick

What is the center of an atom called?

• Electron cloud

• Nucleus

• Shell

• Orbit

Which subatomic particle is found outside the nucleus?

• Proton

• Neutron

• Electron

• Positron

What is the relative mass of a neutron?

• 0

• 1

• 1/1836

• 2

Which scientist proposed the "plum pudding" model of the atom?

• Ernest Rutherford

• J.J. Thomson

• John Dalton

• Niels Bohr

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Double positive

Which experiment led to the discovery of the nucleus?

• Cathode ray tube experiment

• Gold foil experiment

• Oil drop experiment

• Double slit experiment

What does the atomic number of an element represent?

• Number of neutrons

• Number of protons

• Number of electrons in the outer shell

• Atomic mass

Which subatomic particle determines the identity of an element?

• Electron

• Neutron

• Proton

• Positron