Ionic Compound Naming Flashcards: Names, Formulas & Charge Balance
Practice ionic compound naming with 56 English flashcards on neutral formulas, Roman numerals, polyatomic-ion parentheses, and common errors.
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Practice ionic compound names and neutral formulas with 56 English flashcards. This focused deck is for high-school and introductory-college learners who know basic ions and want to apply charge balance consistently.
The cards practice names to formulas, selected formulas back to names, metal-charge inference, one polyatomic-group count, and short repairs of incorrect formulas or missing naming information. Ion charges and polyatomic-ion names are supplied where the target is applying a rule. This is compound-naming practice rather than a table of isolated ions; use the polyatomic ion flashcards for that prerequisite.
The sequence begins with neutrality, cation-first order, subscripts, and the smallest whole-number ratio of intact ions. Fixed-charge binary salts come next, followed by iron, copper, and tin Stock names. Polyatomic groups and ammonium then lead into mixed formula, naming, and error-repair prompts. Selected reverse directions and closely related variants are separated. Every card carries the ionic-naming tag; the review scheduler handles longer-term spacing.
Names follow the usual introductory convention: fixed-charge cations without Roman numerals, variable-charge monatomic metals with Stock Roman numerals, and familiar polyatomic-ion names. Aluminum and aluminium are accepted spelling variants; sodium hydrogen carbonate and sodium bicarbonate are both accepted. This convention does not exhaust all valid systematic names. Arbitrary name-to-example prompts and exhaustive reversals are omitted because they add ambiguity or repetition. Covalent naming, acids, hydrates, organic compounds, coordination complexes, peroxide and mercury(I) special cases, reactions, and solubility are outside this deck. No full-course or examination alignment is claimed.
The questions, explanations, order, and metadata were written independently with AI assistance. Naming and ion facts were checked against Purdue University’s ionic-naming rules and ion reference tables. No competitor cards, source exercise wording, examination questions, or source diagrams were copied. Reference works retain their own rights, and chemical facts are not claimed as proprietary. Original material, including the AI-generated decorative charge-symbol cover, is dedicated under CC0 1.0 to the extent applicable rights exist. This is independent study material without institutional endorsement.
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Kaart 1
Küsimus
In a neutral ionic formula unit, what must the total ionic charge be?
Vastus
Zero. The positive and negative charges must cancel.
Kaart 2
Küsimus
When naming a simple ionic compound, which ion is named first?
Vastus
The cation, followed by the anion.
Kaart 3
Küsimus
Write the formula for lithium fluoride using Li⁺ and F⁻.
Vastus
LiF. One ion of each kind gives +1 − 1 = 0.
Kaart 4
Küsimus
In CaCl₂, what does the subscript 2 count?
Vastus
Two chloride ions for each calcium ion. It does not mean that each chloride ion has a charge of −2.
Kaart 5
Küsimus
Name MgO using the usual fixed-charge ionic naming convention.
Vastus
Magnesium oxide. The ions are Mg²⁺ and O²⁻.
Kaart 6
Küsimus
What is the smallest neutral ratio of Al³⁺ ions to O²⁻ ions?
Vastus
Two Al³⁺ ions to three O²⁻ ions: +6 and −6 cancel.
Kaart 7
Küsimus
Write the formula for magnesium bromide using Mg²⁺ and Br⁻.
Vastus
MgBr₂. Two bromide ions balance one magnesium ion.
Kaart 8
Küsimus
Name Na₂S using the usual fixed-charge ionic naming convention.
Vastus
Sodium sulfide. The sulfur anion is called sulfide.
Kaart 9
Küsimus
Write the simplest formula for calcium oxide using Ca²⁺ and O²⁻.
Vastus
CaO. Equal and opposite charges give a 1:1 ion ratio.
Kaart 10
Küsimus
Write the formula for aluminum nitride using Al³⁺ and N³⁻.
Vastus
AlN. One ion of each kind is neutral. Aluminium nitride is the same compound, with the British spelling.
Kaart 11
Küsimus
Name Mg₃N₂ using the usual fixed-charge ionic naming convention.
Vastus
Magnesium nitride. Three Mg²⁺ ions balance two N³⁻ ions.
Kaart 12
Küsimus
Write the formula for lithium oxide using Li⁺ and O²⁻.
Vastus
Li₂O. Two lithium ions balance one oxide ion.
Kaart 13
Küsimus
Name CaF₂ using the usual fixed-charge ionic naming convention.
Vastus
Calcium fluoride. This convention uses the ion names without a di- prefix for the two fluoride ions.
Kaart 14
Küsimus
A student writes Mg₂O₂ for magnesium oxide, using Mg²⁺ and O²⁻. What is the simplest formula?
Vastus
MgO. The 2:2 ion ratio is neutral but reduces to 1:1.
Kaart 15
Küsimus
Name Al₂S₃ using the usual fixed-charge ionic naming convention.
Vastus
Aluminum sulfide (also spelled aluminium sulfide). Two Al³⁺ ions balance three S²⁻ ions.
Kaart 16
Küsimus
Write the formula for sodium phosphide using Na⁺ and P³⁻.
Vastus
Na₃P. Three sodium ions balance one phosphide ion.
Kaart 17
Küsimus
Name LiF using the usual fixed-charge ionic naming convention.
Vastus
Lithium fluoride. Name the lithium cation first and the fluoride anion second.
Kaart 18
Küsimus
Write the formula for magnesium oxide using Mg²⁺ and O²⁻.
Vastus
MgO. The smallest neutral ratio is one magnesium ion to one oxide ion.
Kaart 19
Küsimus
In the Stock name iron(III) chloride, what does III specify?
Vastus
A +3 charge on each iron ion. For this monatomic ion, its charge equals its oxidation state; III is not an atom count.
Kaart 20
Küsimus
Name FeCl₂ using Stock nomenclature. Chloride is Cl⁻.
Vastus
Iron(II) chloride. Two chloride ions total −2, so the iron ion is Fe²⁺.
Kaart 21
Küsimus
What is the charge on each copper ion in Cu₂O, taking oxide as O²⁻?
Vastus
+1. The two copper ions together must supply +2, so each is Cu⁺.
Kaart 22
Küsimus
Write the formula for tin(IV) oxide, using oxide O²⁻.
Vastus
SnO₂. One Sn⁴⁺ ion balances two oxide ions; reduce a crossed 2:4 ratio to 1:2.
Kaart 23
Küsimus
Name Fe₂O₃ using Stock nomenclature. Oxide is O²⁻.
Vastus
Iron(III) oxide. Three oxide ions total −6; divided between two iron ions, that requires Fe³⁺.
Kaart 24
Küsimus
Write the formula for copper(II) bromide, using bromide Br⁻.
Vastus
CuBr₂. One Cu²⁺ ion needs two bromide ions.
Kaart 25
Küsimus
Name SnCl₂ using Stock nomenclature. Chloride is Cl⁻.
Vastus
Tin(II) chloride. Two Cl⁻ ions require one Sn²⁺ ion.
Kaart 26
Küsimus
Write the formula for iron(II) chloride, using chloride Cl⁻.
Vastus
FeCl₂. One Fe²⁺ ion balances two chloride ions.
Kaart 27
Küsimus
Name CuO using Stock nomenclature. Oxide is O²⁻.
Vastus
Copper(II) oxide. The 1:1 ratio requires Cu²⁺ to balance O²⁻.
Kaart 28
Küsimus
Write the formula for iron(III) sulfide, using sulfide S²⁻.
Vastus
Fe₂S₃. Two Fe³⁺ ions supply +6 and three sulfide ions supply −6.
Kaart 29
Küsimus
Why is the name copper chloride insufficient to choose a single formula in introductory Stock nomenclature?
Vastus
It omits the copper oxidation state. Copper(I) chloride is CuCl; copper(II) chloride is CuCl₂.
Kaart 30
Küsimus
Name SnO₂ using Stock nomenclature. Oxide is O²⁻.
Vastus
Tin(IV) oxide. Two oxide ions total −4, so the tin ion is Sn⁴⁺.
Kaart 31
Küsimus
A student labels Fe₂O₃ as iron(II) oxide. Keeping the name iron(II) oxide, what formula should replace it?
Vastus
FeO. Fe²⁺ and O²⁻ balance in a 1:1 ratio; Fe₂O₃ instead corresponds to iron(III) oxide.
Kaart 32
Küsimus
Name CaCl₂ using the usual introductory fixed-charge convention.
Vastus
Calcium chloride. Calcium is treated as Ca²⁺, so this convention omits the Roman numeral. An explicit oxidation-state name is not a different compound.
Kaart 33
Küsimus
Write the formula for sodium nitrate using Na⁺ and NO₃⁻.
Vastus
NaNO₃. One nitrate ion balances one sodium ion; keep the nitrate formula intact.
Kaart 34
Küsimus
Name K₂CO₃. The polyatomic ion CO₃²⁻ is carbonate.
Vastus
Potassium carbonate. Two K⁺ ions balance one carbonate ion.
Kaart 35
Küsimus
When writing a conventional ionic formula, when do you put a polyatomic ion in parentheses?
Vastus
When more than one of that whole ion is needed. Put the count outside the parentheses and leave the ion’s internal subscripts unchanged.
Kaart 36
Küsimus
Write the formula for calcium hydroxide using Ca²⁺ and OH⁻.
Vastus
Ca(OH)₂. Two whole hydroxide ions balance one calcium ion.
Kaart 37
Küsimus
Name NH₄Cl. NH₄⁺ is ammonium.
Vastus
Ammonium chloride. The cation is the whole NH₄⁺ ion, even though it contains no metal.
Kaart 38
Küsimus
Write the formula for aluminum sulfate using Al³⁺ and SO₄²⁻.
Vastus
Al₂(SO₄)₃. Two aluminum ions supply +6 and three intact sulfate ions supply −6.
Kaart 39
Küsimus
Name Mg(NO₃)₂. NO₃⁻ is nitrate.
Vastus
Magnesium nitrate. One Mg²⁺ ion is balanced by two nitrate ions.
Kaart 40
Küsimus
Write the formula for ammonium phosphate using NH₄⁺ and PO₄³⁻.
Vastus
(NH₄)₃PO₄. Three ammonium ions balance one phosphate ion; only ammonium needs parentheses.
Kaart 41
Küsimus
How many whole hydroxide ions are represented in one formula unit of Ba(OH)₂?
Vastus
Two hydroxide ions. The outer subscript multiplies the entire OH group, giving two O atoms and two H atoms.
Kaart 42
Küsimus
Name Fe₂(SO₄)₃ using Stock nomenclature. SO₄²⁻ is sulfate.
Vastus
Iron(III) sulfate. Three sulfate ions total −6, so each of the two iron ions has charge +3.
Kaart 43
Küsimus
Write the formula for calcium nitrate using Ca²⁺ and NO₃⁻.
Vastus
Ca(NO₃)₂. Two intact nitrate ions supply −2 to balance calcium’s +2.
Kaart 44
Küsimus
Name (NH₄)₂SO₄. NH₄⁺ is ammonium and SO₄²⁻ is sulfate.
Vastus
Ammonium sulfate. Two ammonium ions balance one sulfate ion.
Kaart 45
Küsimus
Write the formula for magnesium phosphate using Mg²⁺ and PO₄³⁻.
Vastus
Mg₃(PO₄)₂. Three magnesium ions and two phosphate ions give +6 and −6.
Kaart 46
Küsimus
Name NaHCO₃. HCO₃⁻ is hydrogen carbonate, also called bicarbonate.
Vastus
Sodium hydrogen carbonate, also called sodium bicarbonate. HCO₃⁻ is one intact anion.
Kaart 47
Küsimus
Repair AlOH₃ as the formula for aluminum hydroxide, using Al³⁺ and OH⁻.
Vastus
Al(OH)₃. Three whole hydroxide ions are needed. AlOH₃ fails to multiply the oxygen count along with the hydrogen count.
Kaart 48
Küsimus
Write the formula for ammonium sulfite using NH₄⁺ and SO₃²⁻.
Vastus
(NH₄)₂SO₃. Two ammonium ions balance one sulfite ion; sulfite retains its three oxygen atoms.
Kaart 49
Küsimus
Name Cu(NO₃)₂ using Stock nomenclature. NO₃⁻ is nitrate.
Vastus
Copper(II) nitrate. Two nitrate ions total −2, requiring Cu²⁺.
Kaart 50
Küsimus
Write the formula for iron(III) sulfate, using sulfate SO₄²⁻.
Vastus
Fe₂(SO₄)₃. Two Fe³⁺ ions balance three sulfate ions.
Kaart 51
Küsimus
Repair K(CO₃)₂ as the formula for potassium carbonate, using K⁺ and CO₃²⁻.
Vastus
K₂CO₃. Two potassium ions balance one carbonate ion. A single carbonate group needs no parentheses.
Kaart 52
Küsimus
Can Mg(NO₃)₂ be simplified to MgNO₃ by removing the outer subscript? Use Mg²⁺ and NO₃⁻.
Vastus
No. The ion ratio is already 1:2. Removing the outer 2 would leave total charge +1 instead of zero.
Kaart 53
Küsimus
Name Ca(OH)₂. OH⁻ is hydroxide.
Vastus
Calcium hydroxide. The two hydroxide ions balance one Ca²⁺ ion; the ion name stays hydroxide.
Kaart 54
Küsimus
What is the charge on each copper ion in Cu₃(PO₄)₂, taking phosphate as PO₄³⁻?
Vastus
+2. Two phosphate ions total −6, shared equally among three copper ions as +2 each.
Kaart 55
Küsimus
Write the formula for sodium nitrite using Na⁺ and NO₂⁻.
Vastus
NaNO₂. One nitrite ion balances one sodium ion. Keep NO₂⁻ intact; NO₃⁻ would be nitrate.
Kaart 56
Küsimus
Repair NH₄SO₄ as the formula for ammonium sulfate, using NH₄⁺ and SO₄²⁻.
Vastus
(NH₄)₂SO₄. Two whole ammonium ions are required to balance one sulfate ion; the 2 goes outside the ammonium parentheses.
56 kaarti
Ionic Compound Naming Flashcards: Names, Formulas & Charge Balance
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