Question

Write the formula of form by
1. cr3+ and f-
2.hg2+ and s2-
3. pb2+ and (po4)3-
4. cu2+ and s2-
5. ca2+ and f-​

Answer 1

Answer:

If we combine two Al3+ ions and three O2- ions, and use subscripts to indicate the number of each ion in the formula, we obtain Al2O3 as the empirical formula. The easiest method to determine the formula for an ionic compound, when given the component ions, is to use the criss-cross method.

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Answer 2

Answer:

Metal Ion Systematic name Common name

Cadmium Cd2+ cadmium ion

Chromium Cr2+ chromium(II) ion chromous ion

Cr3+ chromium(III) ion chromic ion

Cobalt Co2+ cobalt(II) ion cobaltous ion

Co3+ cobalt(III) ion cobaltic ion

Copper Cu+

copper(I) ion cuprous ion

Cu2+ copper(II) ion cupric ion

Gold Au3+ gold(III) ion

Iron Fe2+ iron(II) ion ferrous ion

Fe3+ iron(III) ion ferric ion

Manganese Mn2+ manganese(II) ion manganous ion

Mn3+ manganese(III) ion manganic ion

Mercury Hg2

2+ mercury(I) ion mercurous ion

Hg2+ mercury(II) ion mercuric ion

Nickel Ni2+ nickel(II) ion

Silver Ag+

silver ion

Zinc Zn2+ zinc ion

Tin Sn2+ tin(II) ion stannous ion

Sn4+ tin(IV) ion stannic ion

Lead Pb2+ lead(II) ion plumbous ion

Pb4+ lead(IV) ion plumbic ion

Bismuth Bi3+ bismuth(III) ion

Bi5+ bismuth(V) ion