radiation

Question 1

what is the charge of an atom, neutron, proton and electron?

Answer 1

atom = neutral
neutron = neutral
proton = positive
electron = negative

Question 2

what is the mass of a neutron, proton and electron?

Answer 2

neutron = 1
proton = 1
electron = negligible

Question 3

how do electrons move up and down energy levels?

Answer 3

absorbing and releasing energy

Question 4

what is an isotope?

Answer 4

element with different numbers of neutrons. same protons, different mass.

Question 5

why does a force hold the nucleus together?

Answer 5

to stop the nucleus from exploding

Question 6

what is radioactivity?

Answer 6

an unstable isotope will decay by emitting radiation to form a more stable isotope