atomic number & mass Flashcards
in an atom what numbers are the same
the numbers of protons and electrons
what is the mass number
Number of protons + number of neutrons
what is the atomic number
the number of protons and electrons
what do you do to work out the neutron
you take away the mass number from the atomic number
why do atoms lose or gain electrons
to get a full outer shell
Does atoms have an overall charge
No because they’re neutral
What’s protons relative mass
1
What’s neutrons relative mass
1
What’s electrons relative mass
It’s very small
What’s protons relative charge
+1
What’s neutrons relative charge
0
What’s electrons relative charge
-1
Is protons negatively charged
No it’s positively charged
What are found in the nucleus of an atom
Protons and neutrons
What moves around the nucleus in shells
Electrons
