EXAM

what do electrons in the same shell have in common?

• They have the same amount of energy.

• They are all positively charged.

• They are all made up of atoms.

• They all have neutral charges.

Oxygen has an atomic number of 8. What can you conclude from this fact.

• An Atom of oxygen weighs 8 grams.

• An atom of oxygen has 4 protons and 4 electrons.

• An atom of oxygen has 8 protons.

• An atom of oxygen has 8 positrons.

what can you conclude from the fact that electrons orbit far away from atomic nuclei?

• Electrons are extremely small.

• Atoms are comprised mostly of empty space.

• Atoms consist of subatomic particles.

• Protons have a positive charge.

^{He discovered the neutrons in the nucleus and completed the current atomic model.}

• James Chadwick

• J.J Thomson

• Ernest Rutherford

• Niels Bohr

He found that atoms have smaller parts and found negative electrons that he theorized were surrounded in a sphere of positive charges.

• James Chadwick

• J.J Thomson

• Ernest Rutherford

• Niels Bohr

He found positively charged protons in the nucleus and said that electrons moved around the nucleus

• James Chadwick

• J.J Thomson

• Ernest Rutherford

• Niels Bohr

He found that electrons have specific amounts of energy and move in a specific orbit around the nucleus, like planets orbit the sun.

• James Chadwick

• J.J Thomson

• Ernest Rutherford

• Niels Bohr

Neutron

• No charge

• Positive charge

• Negative charge

• Atomic mass

• Found in nucleus

Proton

• No charge

• Positive charge

• Negative charge

• Atomic mass

• Found in nucles

Electron

• No charge

• Positive charge

• Negative charge

• Atomic mass

• Found in nucleus