atoms Flashcards
1
Q
what does the nucleus contain?
A
protons and neutrons
2
Q
what charge does the nucleus have and why?
A
it has a positive charge because of the protons.
3
Q
what moves around the nucleus?
A
electrons move around the nucleus in electron shells.
4
Q
relative mass and charge of a proton?
A
relative mass: 1
charge: +1
5
Q
relative mass and charge of neutron?
A
relative mass: 1
charge: 0
6
Q
relative mass and charge of electron?
A
relative mass: 0
charge: -1
7
Q
why are atoms neutral (have no charge)?
A
they have the same number of protons as electrons. the charges are opposite so they cancel eachother out,
8
Q
what is an ion?
A
an ion is an atom or group of atoms that has lost or gained electrons.
