periodic table Flashcards
1
Q
period number =
A
number of electron shells
2
Q
group number =
A
number of outer shell electrons
3
Q
periods
A
rows
properties change as you go along
4
Q
groups
A
columns
similar chemical properties
properties gradually change
5
Q
group 0
A
noble gases
inert- don’t react
full outer shell of electrons
not desperate to give up or gain electrons
6
Q
group 1
A
more reactive as atomic number increases
down- outermost electron in a shell that’s further from nucleus
attraction between outermost electron and nucleus becomes less
atoms get bigger and outer electron is easily lost so metals are more reactive
