Chemistry, 13.08.2019 05:30 naysia2006

Deduce the formulas of the following ionic compounds: (a) iron(lll) sulfide, (b) mercury(ll) nitrate, and (c) potassium sulfite.

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Answer from: babygirl1780

For a: The chemical formula for Iron (III) sulfide is Fe_2S_3

For b: The chemical formula for mercury (II) nitrate is Hg(NO_3)_2

For c: The chemical formula for potassium sulfite is K_2SO_3

Explanation:

All the given compounds are ionic compounds. This means that between the atoms complete sharing of electrons takes place.

For a:

Iron is the 26th element of periodic table having electronic configuration of [Ar]3d^64s^2 .

To form $Fe^{3+}$ ion, this element will loose 3 electrons.

Sulfur is the 16th element of periodic table having electronic configuration of [Ne]3s^23p^4 .

To form $S^{2-}$ ion, this element will gain 2 electrons.

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

So, the chemical formula for Iron (III) sulfide is Fe_2S_3

For b:

Mercury is the 80th element of periodic table having electronic configuration of $[Xe]4f^{14}5d^{10}6s^2$ .

To form $Hg^{2+}$ ion, this element will loose 2 electrons.

Nitrate ion is a polyatomic ion having chemical formula of $NO_3^{-}$

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

So, the chemical formula for mercury (II) nitrate is Hg(NO_3)_2

For c:

Potassium is the 19th element of periodic table having electronic configuration of [Ar]4s^1 .

To form $K^{+}$ ion, this element will loose 1 electron.

Sulfite ion is a polyatomic ion having chemical formula of $SO_3^{2-}$

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

So, the chemical formula for potassium sulfite is K_2SO_3

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Deduce the formulas of the following ionic compounds: (a) iron(lll) sulfide, (b) mercury(ll) nitrat...

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