Periodic table Flashcards
1
Q
what is the atomic number of an element
A
how protons that the atoms of that element have
2
Q
what is the mass number
A
it is the total of protons and neutrons in that atom
3
Q
what do periodic table groups reperesent
A
the amount of electrons in the atoms outer most shell
4
Q
what are group one elements known as
A
Alkali Metals
