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