Question

a) Write the chemical formula of all compounds that can be formed by the combination of the following ions :
Mg^2+ , Fe^3+ , O^2- , PO4^3-
b) An element B forms an oxide with formula B2O3.
i) State the valency of B .
ii) write the formula of chloride B and sulphate of B.

Answer 1

is B sodium?? it may be

Answer 2

Answer:

Explanation:

Mg2+ and

PO4^3- . The charge of Mg which is 2 will interchange with PO4 's charge which is 3(because in compound formation,the negative sign is always ignored) to yield the compound Mg3(PO4)2 .Take care