writing ionic formula Flashcards
1
Q
what do ionic compounds contain
A
positive and negative ions
2
Q
why must there be an equal number of positive charges and negative charges
A
so that the compound has no overall charge
3
Q
what happens if the number of charges on the positive ion is the same as the negative ion
A
they cancel each other out
4
Q
what do we need to balance aluminium oxide (Al3+) and (O2-). what is the formula
A
to balance=
Al3+ Al3+ O2- O2- O2-
so the formula is
Al2O3
