topic 1a - atoms, elements, compounds and mixtures (1. atoms)

Question 1

describe the nuclear model

Answer 1

a small nucleus surrounded by electrons.

Question 2

relative size of the nuclus compared to the atom?

Answer 2

1/10000 of the atom

Question 3

relative charge of a neutron?

Answer 3

0

Question 4

relative charge of a proton

Answer 4

+1

Question 5

relative charge of a electron

Answer 5

-1

Question 6

why are atoms uncharged particles

Answer 6

there are the same amount of electrons and protons in an atom and therefore the charges cancel out as the charge of a proton is +1 and -1 for electron

Question 7

how do electrons move around the nucleus

Answer 7

shells