Hi,

Can someone please help???

looking for the empirical formula for Aliminium selenide if Se has a valency of -2 and aliminium 3!

Thanks :)

Wouldn't it be Al2Se3?
Al is +3 and 3 x 2 = +6.
Se is -2 and -2 x 3 = -6
And +6 - 6 = 0 and compounds must be zero.

im lost!! hehe

but that makes sense, a bit!

Thanks a million :)

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