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.
Κάρτες σε αυτήν τη δέσμη
Κάρτα 1
Ερώτηση
In a neutral ionic formula unit, what must the total ionic charge be?
Απάντηση
Zero. The positive and negative charges must cancel.
Κάρτα 2
Ερώτηση
When naming a simple ionic compound, which ion is named first?
Απάντηση
The cation, followed by the anion.
Κάρτα 3
Ερώτηση
Write the formula for lithium fluoride using Li⁺ and F⁻.
Απάντηση
LiF. One ion of each kind gives +1 − 1 = 0.
Κάρτα 4
Ερώτηση
In CaCl₂, what does the subscript 2 count?
Απάντηση
Two chloride ions for each calcium ion. It does not mean that each chloride ion has a charge of −2.
Κάρτα 5
Ερώτηση
Name MgO using the usual fixed-charge ionic naming convention.
Απάντηση
Magnesium oxide. The ions are Mg²⁺ and O²⁻.
Κάρτα 6
Ερώτηση
What is the smallest neutral ratio of Al³⁺ ions to O²⁻ ions?
Απάντηση
Two Al³⁺ ions to three O²⁻ ions: +6 and −6 cancel.
Κάρτα 7
Ερώτηση
Write the formula for magnesium bromide using Mg²⁺ and Br⁻.
Απάντηση
MgBr₂. Two bromide ions balance one magnesium ion.
Κάρτα 8
Ερώτηση
Name Na₂S using the usual fixed-charge ionic naming convention.
Απάντηση
Sodium sulfide. The sulfur anion is called sulfide.
Κάρτα 9
Ερώτηση
Write the simplest formula for calcium oxide using Ca²⁺ and O²⁻.
Απάντηση
CaO. Equal and opposite charges give a 1:1 ion ratio.
Κάρτα 10
Ερώτηση
Write the formula for aluminum nitride using Al³⁺ and N³⁻.
Απάντηση
AlN. One ion of each kind is neutral. Aluminium nitride is the same compound, with the British spelling.
Κάρτα 11
Ερώτηση
Name Mg₃N₂ using the usual fixed-charge ionic naming convention.
Απάντηση
Magnesium nitride. Three Mg²⁺ ions balance two N³⁻ ions.
Κάρτα 12
Ερώτηση
Write the formula for lithium oxide using Li⁺ and O²⁻.
Απάντηση
Li₂O. Two lithium ions balance one oxide ion.
Κάρτα 13
Ερώτηση
Name CaF₂ using the usual fixed-charge ionic naming convention.
Απάντηση
Calcium fluoride. This convention uses the ion names without a di- prefix for the two fluoride ions.
Κάρτα 14
Ερώτηση
A student writes Mg₂O₂ for magnesium oxide, using Mg²⁺ and O²⁻. What is the simplest formula?
Απάντηση
MgO. The 2:2 ion ratio is neutral but reduces to 1:1.
Κάρτα 15
Ερώτηση
Name Al₂S₃ using the usual fixed-charge ionic naming convention.
Απάντηση
Aluminum sulfide (also spelled aluminium sulfide). Two Al³⁺ ions balance three S²⁻ ions.
Κάρτα 16
Ερώτηση
Write the formula for sodium phosphide using Na⁺ and P³⁻.
Απάντηση
Na₃P. Three sodium ions balance one phosphide ion.
Κάρτα 17
Ερώτηση
Name LiF using the usual fixed-charge ionic naming convention.
Απάντηση
Lithium fluoride. Name the lithium cation first and the fluoride anion second.
Κάρτα 18
Ερώτηση
Write the formula for magnesium oxide using Mg²⁺ and O²⁻.
Απάντηση
MgO. The smallest neutral ratio is one magnesium ion to one oxide ion.
Κάρτα 19
Ερώτηση
In the Stock name iron(III) chloride, what does III specify?
Απάντηση
A +3 charge on each iron ion. For this monatomic ion, its charge equals its oxidation state; III is not an atom count.
Κάρτα 20
Ερώτηση
Name FeCl₂ using Stock nomenclature. Chloride is Cl⁻.
Απάντηση
Iron(II) chloride. Two chloride ions total −2, so the iron ion is Fe²⁺.
Κάρτα 21
Ερώτηση
What is the charge on each copper ion in Cu₂O, taking oxide as O²⁻?
Απάντηση
+1. The two copper ions together must supply +2, so each is Cu⁺.
Κάρτα 22
Ερώτηση
Write the formula for tin(IV) oxide, using oxide O²⁻.
Απάντηση
SnO₂. One Sn⁴⁺ ion balances two oxide ions; reduce a crossed 2:4 ratio to 1:2.
Κάρτα 23
Ερώτηση
Name Fe₂O₃ using Stock nomenclature. Oxide is O²⁻.
Απάντηση
Iron(III) oxide. Three oxide ions total −6; divided between two iron ions, that requires Fe³⁺.
Κάρτα 24
Ερώτηση
Write the formula for copper(II) bromide, using bromide Br⁻.
Απάντηση
CuBr₂. One Cu²⁺ ion needs two bromide ions.
Κάρτα 25
Ερώτηση
Name SnCl₂ using Stock nomenclature. Chloride is Cl⁻.
Απάντηση
Tin(II) chloride. Two Cl⁻ ions require one Sn²⁺ ion.
Κάρτα 26
Ερώτηση
Write the formula for iron(II) chloride, using chloride Cl⁻.
Απάντηση
FeCl₂. One Fe²⁺ ion balances two chloride ions.
Κάρτα 27
Ερώτηση
Name CuO using Stock nomenclature. Oxide is O²⁻.
Απάντηση
Copper(II) oxide. The 1:1 ratio requires Cu²⁺ to balance O²⁻.
Κάρτα 28
Ερώτηση
Write the formula for iron(III) sulfide, using sulfide S²⁻.
Απάντηση
Fe₂S₃. Two Fe³⁺ ions supply +6 and three sulfide ions supply −6.
Κάρτα 29
Ερώτηση
Why is the name copper chloride insufficient to choose a single formula in introductory Stock nomenclature?
Απάντηση
It omits the copper oxidation state. Copper(I) chloride is CuCl; copper(II) chloride is CuCl₂.
Κάρτα 30
Ερώτηση
Name SnO₂ using Stock nomenclature. Oxide is O²⁻.
Απάντηση
Tin(IV) oxide. Two oxide ions total −4, so the tin ion is Sn⁴⁺.
Κάρτα 31
Ερώτηση
A student labels Fe₂O₃ as iron(II) oxide. Keeping the name iron(II) oxide, what formula should replace it?
Απάντηση
FeO. Fe²⁺ and O²⁻ balance in a 1:1 ratio; Fe₂O₃ instead corresponds to iron(III) oxide.
Κάρτα 32
Ερώτηση
Name CaCl₂ using the usual introductory fixed-charge convention.
Απάντηση
Calcium chloride. Calcium is treated as Ca²⁺, so this convention omits the Roman numeral. An explicit oxidation-state name is not a different compound.
Κάρτα 33
Ερώτηση
Write the formula for sodium nitrate using Na⁺ and NO₃⁻.
Απάντηση
NaNO₃. One nitrate ion balances one sodium ion; keep the nitrate formula intact.
Κάρτα 34
Ερώτηση
Name K₂CO₃. The polyatomic ion CO₃²⁻ is carbonate.
Απάντηση
Potassium carbonate. Two K⁺ ions balance one carbonate ion.
Κάρτα 35
Ερώτηση
When writing a conventional ionic formula, when do you put a polyatomic ion in parentheses?
Απάντηση
When more than one of that whole ion is needed. Put the count outside the parentheses and leave the ion’s internal subscripts unchanged.
Κάρτα 36
Ερώτηση
Write the formula for calcium hydroxide using Ca²⁺ and OH⁻.
Απάντηση
Ca(OH)₂. Two whole hydroxide ions balance one calcium ion.
Κάρτα 37
Ερώτηση
Name NH₄Cl. NH₄⁺ is ammonium.
Απάντηση
Ammonium chloride. The cation is the whole NH₄⁺ ion, even though it contains no metal.
Κάρτα 38
Ερώτηση
Write the formula for aluminum sulfate using Al³⁺ and SO₄²⁻.
Απάντηση
Al₂(SO₄)₃. Two aluminum ions supply +6 and three intact sulfate ions supply −6.
Κάρτα 39
Ερώτηση
Name Mg(NO₃)₂. NO₃⁻ is nitrate.
Απάντηση
Magnesium nitrate. One Mg²⁺ ion is balanced by two nitrate ions.
Κάρτα 40
Ερώτηση
Write the formula for ammonium phosphate using NH₄⁺ and PO₄³⁻.
Απάντηση
(NH₄)₃PO₄. Three ammonium ions balance one phosphate ion; only ammonium needs parentheses.
Κάρτα 41
Ερώτηση
How many whole hydroxide ions are represented in one formula unit of Ba(OH)₂?
Απάντηση
Two hydroxide ions. The outer subscript multiplies the entire OH group, giving two O atoms and two H atoms.
Κάρτα 42
Ερώτηση
Name Fe₂(SO₄)₃ using Stock nomenclature. SO₄²⁻ is sulfate.
Απάντηση
Iron(III) sulfate. Three sulfate ions total −6, so each of the two iron ions has charge +3.
Κάρτα 43
Ερώτηση
Write the formula for calcium nitrate using Ca²⁺ and NO₃⁻.
Απάντηση
Ca(NO₃)₂. Two intact nitrate ions supply −2 to balance calcium’s +2.
Κάρτα 44
Ερώτηση
Name (NH₄)₂SO₄. NH₄⁺ is ammonium and SO₄²⁻ is sulfate.
Απάντηση
Ammonium sulfate. Two ammonium ions balance one sulfate ion.
Κάρτα 45
Ερώτηση
Write the formula for magnesium phosphate using Mg²⁺ and PO₄³⁻.
Απάντηση
Mg₃(PO₄)₂. Three magnesium ions and two phosphate ions give +6 and −6.
Κάρτα 46
Ερώτηση
Name NaHCO₃. HCO₃⁻ is hydrogen carbonate, also called bicarbonate.
Απάντηση
Sodium hydrogen carbonate, also called sodium bicarbonate. HCO₃⁻ is one intact anion.
Κάρτα 47
Ερώτηση
Repair AlOH₃ as the formula for aluminum hydroxide, using Al³⁺ and OH⁻.
Απάντηση
Al(OH)₃. Three whole hydroxide ions are needed. AlOH₃ fails to multiply the oxygen count along with the hydrogen count.
Κάρτα 48
Ερώτηση
Write the formula for ammonium sulfite using NH₄⁺ and SO₃²⁻.
Απάντηση
(NH₄)₂SO₃. Two ammonium ions balance one sulfite ion; sulfite retains its three oxygen atoms.
Κάρτα 49
Ερώτηση
Name Cu(NO₃)₂ using Stock nomenclature. NO₃⁻ is nitrate.
Απάντηση
Copper(II) nitrate. Two nitrate ions total −2, requiring Cu²⁺.
Κάρτα 50
Ερώτηση
Write the formula for iron(III) sulfate, using sulfate SO₄²⁻.
Απάντηση
Fe₂(SO₄)₃. Two Fe³⁺ ions balance three sulfate ions.
Κάρτα 51
Ερώτηση
Repair K(CO₃)₂ as the formula for potassium carbonate, using K⁺ and CO₃²⁻.
Απάντηση
K₂CO₃. Two potassium ions balance one carbonate ion. A single carbonate group needs no parentheses.
Κάρτα 52
Ερώτηση
Can Mg(NO₃)₂ be simplified to MgNO₃ by removing the outer subscript? Use Mg²⁺ and NO₃⁻.
Απάντηση
No. The ion ratio is already 1:2. Removing the outer 2 would leave total charge +1 instead of zero.
Κάρτα 53
Ερώτηση
Name Ca(OH)₂. OH⁻ is hydroxide.
Απάντηση
Calcium hydroxide. The two hydroxide ions balance one Ca²⁺ ion; the ion name stays hydroxide.
Κάρτα 54
Ερώτηση
What is the charge on each copper ion in Cu₃(PO₄)₂, taking phosphate as PO₄³⁻?
Απάντηση
+2. Two phosphate ions total −6, shared equally among three copper ions as +2 each.
Κάρτα 55
Ερώτηση
Write the formula for sodium nitrite using Na⁺ and NO₂⁻.
Απάντηση
NaNO₂. One nitrite ion balances one sodium ion. Keep NO₂⁻ intact; NO₃⁻ would be nitrate.
Κάρτα 56
Ερώτηση
Repair NH₄SO₄ as the formula for ammonium sulfate, using NH₄⁺ and SO₄²⁻.
Απάντηση
(NH₄)₂SO₄. Two whole ammonium ions are required to balance one sulfate ion; the 2 goes outside the ammonium parentheses.
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Ionic Compound Naming Flashcards: Names, Formulas & Charge Balance
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