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