1
Q
where are protons and neutrons found
A
the nucleus
2
Q
where are electrons found
A
shells around the nucleus
3
Q
what is an atomic number
A
number of protons
4
Q
what is a mass number
A
number of protons and neutrons
5
Q
isotope definition
A
atoms with the same number of protons but different number of neutrons
6
Q
what is a relative atomic mass of an atom
A
the average mass
7
Q
what does the period show about an element
A
number of shells
8
Q
what does the group show about an element
A
number of electrons in its outer shell
