Atomic Models

Who was the Greek philosopher who proposed that matter is made up of very tiny pieces which he called atomos, meaning "indivisible?"

• Aristotle

• Democritus

• Empedocles

• Pythagoiras

Which are Dalton's atomic theory assumptions?

• Matter is made up of atoms. It is impossible to divide or destroy an atom.

• All atoms of the same element are alike and atoms of different elements are different.

• Atoms combine in definite whole number ratios. For example, water is a compound made up of 2 atoms of hydrogen and one atom of oxygen.

• In a chemical reactions, atoms are separated, joined, or rearranged to form new molecules but these atoms are never changed into atoms of another element.

In his gold foil experiment, Rutherford bombarded the foil with alpha rays that _______________ when they hit the nucleus.

Whose atomic model is similar to a chocolate chip cookie?

• Niels Bohr

• James Chadwick

• Erwin Schrodinger

• JJ Thompson

Who proposed that electrons occupy energy levels while moving around the nucleus?

• Niels Bohr

• James Chadwick

• Ernest Rutherford

• Erwin Schrodinger

Differentiate Bohr's energy level model of an atom to Schrodinger's quantum mechanical model of an atom