History of Atom and Modern Atomic Theory

Which statement is not part of the original atomic theory?

• Atoms consist of smaller particles of matter.
• Atoms cannot be created or destroyed.
• All atoms of the same element have the same mass.
• Atoms join together to form compounds.

John Dalton thought that an atom is like a(n)

• plum pudding.
• solar system.
• hard solid ball.
• vacuum tube.

The scientist who discovered protons was

• John Dalton.
• J. J. Thomson.
• Ernest Rutherford.
• James Chadwick.

Aristotle thought that

• atoms exist.
• atoms are uncuttable.
• all matter consists of atoms.
• the idea of atoms is ridiculous.

Rutherford concluded from his experiments that

• all the positive charge of an atom is concentrated in the center.
• positive charge is spread evenly throughout an atom.
• electrons orbit the positively charged nucleus.
• two of the above

Thomson aimed a beam of alpha particles at gold foil.

• TRUE
• FALSE

The plums in the plum pudding model represent protons.

• TRUE
• FALSE

The planets in the planetary model represent electrons.

• TRUE
• FALSE

The first subatomic particle to be discovered was the proton.

• TRUE
• FALSE

Dalton thought that all substances are made of atoms.

• TRUE
• FALSE