History of Atomic Theory

Front

What model of the atom proposed that atoms were positive spheres with negative electrons in them?

Back

Plum Pudding Model

Front

What particle did J.J. Thomson discover in his model of the atom?

Back

Electrons

Front

What does the law of conservation of mass state?

Back

Mass is neither created nor destroyed during chemical reactions or physical changes.

Front

Which scientist proposed the Solid Sphere Model of the atom?

Back

John Dalton

Front

Who developed the Planetary Model of the atom?

Back

Niels Bohr

Front

What is the main idea of Dalton's Atomic Theory?

Back

All matter is made up of indivisible atoms, which cannot be created or destroyed.

Front

What did Rutherford's gold foil experiment demonstrate?

Back

The existence of a small, dense nucleus at the center of the atom.

Front

What is the charge of an electron?

Back

Negative

Front

What is the charge of a proton?

Back

Positive

Front

What is the main difference between protons and neutrons?

Back

Protons have a positive charge, while neutrons have no charge.