4.1 Development of the Atomic Theory People

Question 1

Around 440 BC Democritus said that a particle at it’s point of here it could not be cut any smaller is called atom. Atom is a Greek word that means “not able to be divided.” Democritus came from Greek.

Answer 1

Democritus

Question 2

He was a Greek philosopher, which was born 384 BC in Stagira, Greece. He disagree with Democritus’s ideas. He believed that you will never ended up with a particle that could not be cut.

Answer 2

Aristole

Question 3

He was a British school teacher and chemist. He developed his atomic theory from observations gathered from many experiments.

Answer 3

Dalton

Question 4

In 1897, he found that there was a mistake in Dalton’s theory. He was a British scientist. He experimented with a cathode-ray tube.

Answer 4

Thomson

Question 5

In 1909, a student of Thomson’s named Ernest Rutherford decided to test Thomson’s theory. He designed and experimented to study a part of an atom. He aimed a beam of small, positively charged particles at a thin sheet of gold foil.

Answer 5

Rutherford

Question 6

In 1913, Niels Bohr, a Danish scientist who worked with Rutherford, studied the way atoms react with light.

Answer 6

Bohr

Question 7

He is an Austrian Physicist. He did important work. He further explained the nature of electrons in the atom. The exact path of an electron cannot be predicted.

Answer 7

Erwin Schrodinger

Question 8

He is a German Physicist. He did important work just like Schrodinger. He further explained the nature of electrons in the atom. He also stated that electrons do not travel in definite paths as Bohr suggested.

Answer 8

Werner Heisenberg