Atomic Structure

Question 1

What are the Group 1 metals called?

Answer 1

Alkalis

Question 2

What are Group 7 metals called?

Answer 2

halogens

Question 3

What is the overall charge of a nucleus?

Answer 3

positive

Question 4

How can electrons change energy levels?

Answer 4

absorbing or emitting electromagnetic radiation

Question 5

What did scientists discover in 1897?

Answer 5

atoms contain negatively charged particles (electrons)

showers that atoms have an internal structure and were not tiny spheres

Question 6

What was the plum-pudding model?

Answer 6

a ball of positive charge embedded with negative electrons

Question 7

What was the result of the alpha-scattering?

Answer 7

most particles went straight threw which meant most of the atoms was empty space

Some of the particles deflected which meant the centre of the atom must have a positive charged and repelled the alpha particles

Some particles bounced straight back which meant the mass of the atom was concentrated at the nucleus

Question 8

What did Niels Bohr discover?

Answer 8

electrons orbit around the nucleus at fixed distances in energy levels

Question 9

What did James Chadwick discover?

Answer 9

atoms contained neutrons that have no charge (neutral)