Atomic Structure

Question 1

In 1897 what did Thomson discover ? And what did this show about atoms

Answer 1

The electron. This shoes that atoms weren’t solid and indivisible.

Question 2

After thomsons discovery what was the new model do the atom called ?

Answer 2

The plum pudding model

Question 3

What did Rutherford discover ?

Answer 3

There is a tiny nucleus with a positive charge. But most the atom is empty space.

Question 4

Describe Rutherfords experiment

Answer 4

Fired alpha particles at a thin sheet of gold.

Question 5

Who proposed the new model of an atom where electrons exist in shells or orbits of fixed energy ?

Answer 5

Bohr

Question 6

After Bohrs discovery what was the next development in the model of atomic structure ?

Answer 6

Not all electrons have the same energy. Sub shells were discovered.

Question 7

At the start of the 19th century how did Dalton describe atoms ?

Answer 7

Solid spheres. Different spheres made up different elements.