The Atom

The smallest particle into which an element can be divided and still be the same element.

• molecule

• atom

• compound

• cells

Who is the Greek philosopher thought matter could be divided into smaller units until you obtained a particle that could not be cut?

• Aristotle

• Aristarchus

• Democritus

• Socrates

In 1808, _________ published an atomic theory, stating that all matter is made up of atoms that cannot be created, divided, or destroyed.

• J.J. Thomson

• John Dalton

• Niels Bohr

• Ernest Rutherford

In 1909, ____________experiment suggested that atoms have a nucleus—a small, dense center that has a positive charge.

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Niels Bohr

In 1897, __________ experiments provided evidence that atoms contain negatively charged particles.

• J.J. Thomson's

• John Dalton's

• Ernest Rutherford's

• James Chadwick's

Whose atomic model is shown in the picture?

• J.J. Thomson

• James Chadwick

• Niels Bohr

• Ernest Rutherford

In 1932, who discovered that the nucleus contains uncharged particles?

• Ernest Rutherford

• John Dalton

• J.J. Thomson

• James Chadwick

Together, protons and neutrons form the _________ of the atom.

• cloud

• cell

• nucleus

• ring

What is the atomic number of this Element?

• 6

• 12

• 18

• 24

What is the atomic mass of this Element?

• 6

• 12

• 18

• 20