Atomic Theory

Front

Which scientist saw the atom as a positively charged sphere with negative particles (electrons) embedded within? Options: J.J. Thomson, Niels Bohr, John Dalton, Ernest Rutherford

Back

J.J. Thomson

Front

Which scientist proposed a model of the atom in which the electrons are orbiting at different levels? Options: Niels Bohr, James Chadwick, John Dalton, Ernest Rutherford

Back

Niels Bohr

Front

Bohr's model of the atom proposed that ___? Options: electrons move around the nucleus in fixed orbits, neutrons move around the nucleus, neutrons do not exist, but are just paired protons and electrons, the nucleus spins

Back

electrons move around the nucleus in fixed orbits

Front

J.J. Thomson's model of the atom is given this name because he believed that electrons were spread randomly throughout a positive sphere.

Back

plum pudding model

Front

Which scientist discovered that all atoms of a particular element are identical but different from atoms of other elements? Options: Dalton, Thomson, Bohr, Rutherford

Back

Dalton

Front

Which scientist used his gold foil experiment to show that an atom has a small, central, positively charged nucleus that contains most of the atom's mass? Options: Rutherford, Bohr, Thomson, Dalton

Back

Rutherford

Front

Which scientist discovered that most of an atom's mass is contained in its nucleus and the rest is nearly empty space? Options: Rutherford, Dalton, Bohr, Thomson

Back

Rutherford

Front

Order the atomic models below from the oldest to the most recent: 1, 2, 3, and 4.

Back

3, 2, 4, and 1

Front

Which scientist proposed a model of the atom in which the individual atoms were thought of as tiny solids like balls or marbles?

Back

John Dalton

Front

Bohr's model of the atom: large positive sphere with electrons in orbits. What was this model nicknamed? Options: The Planetary Model, The Billiard Ball Model, The Nuclear Model, The Plum Pudding Model

Back

The Planetary Model