al+3. o-2
zn+2. n+5. o-2
Mg+2. cl-1
Ca+2. o-2
h+1. f-1
s+6. o-2
k+1. oh-1
h2+1. si+6. o-2
fe+3. он-1
h2+1. s+6 o-2
al+3. o-2
zn+2. n+5. o-2
Mg+2. cl-1
Ca+2. o-2
h+1. f-1
s+6. o-2
k+1. oh-1
h2+1. si+6. o-2
fe+3. он-1
h2+1. s+6 o-2