[عزجهينة]

the ratio of proton to elictron ca +2 with z=20 a=40 is
10:9
2:1
1:2
1:1
how many grams of sf4 from .600 g of scl2 and .350 g of naf the equathion of reaction is
3scl2+4naf ~sf4+s2cl2+4nacl

وفيه سؤال ثالث iron sand mixture is example of