ICP - Unit 9 Day 3 - Atomic Theory Assignment

Front

Who first developed the four rules for atomic theory?

Back

John Dalton

Front

What did J.J. Thomson discover about atoms?

Back

Atoms contain negatively charged particles.

Front

What did Rutherford's gold foil experiment reveal?

Back

There is a dense positively charged nucleus at the center of an atom.

Front

What is the correct sequence of scientists who made major changes in the atomic model?

Back

1. John Dalton, 2. J.J. Thomson, 3. Ernest Rutherford, 4. Niels Bohr, 5. Electron Cloud (many scientists)

Front

What is a negatively charged particle found outside the nucleus?

Back

Electron

Front

What is the main postulate of Dalton's atomic theory?

Back

All matter is made up of atoms, which are indivisible and indestructible.

Front

What did the discovery of the electron change about the atomic model?

Back

It introduced the idea that atoms are not indivisible and contain smaller particles.

Front

What is the charge of a proton?

Back

Positive charge.

Front

What is the charge of a neutron?

Back

No charge (neutral).

Front

What is the significance of the electron cloud model?

Back

It describes the probable locations of electrons around the nucleus.