About the Atom

The positive subatomic particle is the _____.

• atom

• electron

• proton

• neutron

Who first proposed that everything in the world was made up of tiny particles?

• Aristotle
• Democritus
• Plato
• Socrates

The electron was discovered in 1897.  Who discovered it?

• Ernest Rutherford
• John Dalton
• J. J. Thomson
• Niels Bohr

Whose model showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons?

• J. J. Thomson
• John Dalton
• Ernest Rutherford
• Niels Bohr

Who concluded that atoms consisted largely of empty space with most of the mass concentrated in the center?

• J. J. Thomson
• Max Planck
• Ernest Rutherford
• Niels Bohr

Who stipulated that electrons orbit the nucleus at fixed energies and distances?

• Albert Einstein
• Max Planck
• Ernest Rutherford
• Niels Bohr

All matter consists of particles called

• Units

• Atoms

• Cubes

• Pints

Each electron has a _________________ electrical charge

• Positive

• Negative

• Neutral

• Shocking

Each neutron has an electrically_________________charge

• Positive

• Negative

• Neutral

• Shocking

An element is determined by the number of ___________________ (also known as its atomic number).

• Neutrons

• Electrons

• Protons

• Wontons