5.1.1.3 the development of the model of the atom (common content with physics)

Question 1

New experimental evidence may lead to a specific model being ________ or r_________.

Answer 1

Changed, replaced

Question 2

Before the discovery of the electron what were they thought to be?

Answer 2

Tiny spheres that could not be divided.

Question 3

The discovery of the electron led to the plum pudding model of the atom. What is the plum pudding model of the atom?

Answer 3

The plum pudding model suggested that the atom is a ball of positive charge with negative electrons embedded in it.

Question 4

The results from the alpha particle scattering experiment led to the conclusion that the _____ of an atom was concentrated at the centre (______) and that the _______ was charged.

Answer 4

Mass, nucleus, nucleus

Question 5

What replaced the plum pudding model?

Answer 5

The nuclear model.

Question 6

______ _____ adapted the nucleus model by suggesting that electrons orbit the nucleus at specific distances.

Answer 6

Niels Bohr

Question 7

Later experiments led to the idea that the positive charge of any nucleus could be ____________ into a whole number of smaller particles, each particle having the same amount of ________ charge.

Answer 7

Subdivided, positive.

Question 8

What did James Chadwick’s work provide?

Answer 8

The evidence to show the existence of neutrons within the nucleus. This was about 20 years after the nucleus became an accepted scientific idea.