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Polyatomic Ion Flashcards: 30 Names, Formulas & Charges

Learn 30 commonly taught polyatomic ions with 60 two-way flashcards for name, formula, and charge recall.

By author Flashcards Open Source App

About this deck

These polyatomic ion flashcards cover 30 commonly taught ions in 60 two-way cards. You’ll practice name → exact conventional formula with charge and formula with charge → canonical or common name. Each direction has its own card, so recognizing a formula does not stand in for recalling it.

Every formula is written as standalone LaTeX with conventional subscripts and a superscript charge. The fixed sequence interleaves both directions and ion families, keeps close variants at least three unrelated cards apart, and leaves longer-term spacing to the review scheduler.

Hydrogen carbonate (bicarbonate) and hydrogen sulfate (bisulfate) are the only paired names. The deck leaves out monatomic ions; borate, phosphite, and silicate, whose classroom species or formula conventions can vary; and compound naming, charge balancing, structures, oxidation states, solubility, colors, applications, reaction prediction, and general naming-rule theory.

ChEBI records were used to verify names, formulas, and charges, with PubChem used as an independent cross-check where its exact ion record was unambiguous. All prompts, answers, selection, order, metadata, and cover composition were created independently. No source or competitor prose, images, screenshots, selection order, trade dress, or logos were copied. Facts are not claimed as proprietary. The original wording, organization, metadata, and cover are dedicated under CC0 1.0 to the extent applicable rights exist.

Cards in this deck

  1. Card 1

    Question

    What is the formula, including its charge, for chlorite?

    Answer

    ClO2−\mathrm{ClO}_{2}^{-}

  2. Card 2

    Question

    HSO4−\mathrm{HSO}_{4}^{-}

    What is the name of this polyatomic ion?

    Answer

    Hydrogen sulfate (bisulfate)

  3. Card 3

    Question

    What is the formula, including its charge, for dihydrogen phosphate?

    Answer

    H2PO4−\mathrm{H}_{2}\mathrm{PO}_{4}^{-}

  4. Card 4

    Question

    SCN−\mathrm{SCN}^{-}

    What is the name of this polyatomic ion?

    Answer

    Thiocyanate

  5. Card 5

    Question

    What is the formula, including its charge, for hypochlorite?

    Answer

    ClO−\mathrm{ClO}^{-}

  6. Card 6

    Question

    S2O32−\mathrm{S}_{2}\mathrm{O}_{3}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Thiosulfate

  7. Card 7

    Question

    What is the formula, including its charge, for phosphate?

    Answer

    PO43−\mathrm{PO}_{4}^{3-}

  8. Card 8

    Question

    OCN−\mathrm{OCN}^{-}

    What is the name of this polyatomic ion?

    Answer

    Cyanate

  9. Card 9

    Question

    What is the formula, including its charge, for perchlorate?

    Answer

    ClO4−\mathrm{ClO}_{4}^{-}

  10. Card 10

    Question

    SO32−\mathrm{SO}_{3}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Sulfite

  11. Card 11

    Question

    What is the formula, including its charge, for hydrogen phosphate?

    Answer

    HPO42−\mathrm{HPO}_{4}^{2-}

  12. Card 12

    Question

    OH−\mathrm{OH}^{-}

    What is the name of this polyatomic ion?

    Answer

    Hydroxide

  13. Card 13

    Question

    What is the formula, including its charge, for chlorate?

    Answer

    ClO3−\mathrm{ClO}_{3}^{-}

  14. Card 14

    Question

    SO42−\mathrm{SO}_{4}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Sulfate

  15. Card 15

    Question

    What is the formula, including its charge, for arsenate?

    Answer

    AsO43−\mathrm{AsO}_{4}^{3-}

  16. Card 16

    Question

    NO3−\mathrm{NO}_{3}^{-}

    What is the name of this polyatomic ion?

    Answer

    Nitrate

  17. Card 17

    Question

    What is the formula, including its charge, for bromate?

    Answer

    BrO3−\mathrm{BrO}_{3}^{-}

  18. Card 18

    Question

    Cr2O72−\mathrm{Cr}_{2}\mathrm{O}_{7}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Dichromate

  19. Card 19

    Question

    What is the formula, including its charge, for hydrogen carbonate (bicarbonate)?

    Answer

    HCO3−\mathrm{HCO}_{3}^{-}

  20. Card 20

    Question

    C2H3O2−\mathrm{C}_{2}\mathrm{H}_{3}\mathrm{O}_{2}^{-}

    What is the name of this polyatomic ion?

    Answer

    Acetate

  21. Card 21

    Question

    What is the formula, including its charge, for iodate?

    Answer

    IO3−\mathrm{IO}_{3}^{-}

  22. Card 22

    Question

    CN−\mathrm{CN}^{-}

    What is the name of this polyatomic ion?

    Answer

    Cyanide

  23. Card 23

    Question

    What is the formula, including its charge, for hydronium?

    Answer

    H3O+\mathrm{H}_{3}\mathrm{O}^{+}

  24. Card 24

    Question

    O22−\mathrm{O}_{2}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Peroxide

  25. Card 25

    Question

    What is the formula, including its charge, for chromate?

    Answer

    CrO42−\mathrm{CrO}_{4}^{2-}

  26. Card 26

    Question

    NO2−\mathrm{NO}_{2}^{-}

    What is the name of this polyatomic ion?

    Answer

    Nitrite

  27. Card 27

    Question

    What is the formula, including its charge, for ammonium?

    Answer

    NH4+\mathrm{NH}_{4}^{+}

  28. Card 28

    Question

    CO32−\mathrm{CO}_{3}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Carbonate

  29. Card 29

    Question

    What is the formula, including its charge, for oxalate?

    Answer

    C2O42−\mathrm{C}_{2}\mathrm{O}_{4}^{2-}

  30. Card 30

    Question

    MnO4−\mathrm{MnO}_{4}^{-}

    What is the name of this polyatomic ion?

    Answer

    Permanganate

  31. Card 31

    Question

    ClO2−\mathrm{ClO}_{2}^{-}

    What is the name of this polyatomic ion?

    Answer

    Chlorite

  32. Card 32

    Question

    What is the formula, including its charge, for sulfate?

    Answer

    SO42−\mathrm{SO}_{4}^{2-}

  33. Card 33

    Question

    H2PO4−\mathrm{H}_{2}\mathrm{PO}_{4}^{-}

    What is the name of this polyatomic ion?

    Answer

    Dihydrogen phosphate

  34. Card 34

    Question

    What is the formula, including its charge, for thiocyanate?

    Answer

    SCN−\mathrm{SCN}^{-}

  35. Card 35

    Question

    IO3−\mathrm{IO}_{3}^{-}

    What is the name of this polyatomic ion?

    Answer

    Iodate

  36. Card 36

    Question

    What is the formula, including its charge, for hydrogen sulfate (bisulfate)?

    Answer

    HSO4−\mathrm{HSO}_{4}^{-}

  37. Card 37

    Question

    PO43−\mathrm{PO}_{4}^{3-}

    What is the name of this polyatomic ion?

    Answer

    Phosphate

  38. Card 38

    Question

    What is the formula, including its charge, for dichromate?

    Answer

    Cr2O72−\mathrm{Cr}_{2}\mathrm{O}_{7}^{2-}

  39. Card 39

    Question

    BrO3−\mathrm{BrO}_{3}^{-}

    What is the name of this polyatomic ion?

    Answer

    Bromate

  40. Card 40

    Question

    What is the formula, including its charge, for peroxide?

    Answer

    O22−\mathrm{O}_{2}^{2-}

  41. Card 41

    Question

    What is the formula, including its charge, for sulfite?

    Answer

    SO32−\mathrm{SO}_{3}^{2-}

  42. Card 42

    Question

    What is the formula, including its charge, for nitrite?

    Answer

    NO2−\mathrm{NO}_{2}^{-}

  43. Card 43

    Question

    ClO−\mathrm{ClO}^{-}

    What is the name of this polyatomic ion?

    Answer

    Hypochlorite

  44. Card 44

    Question

    HCO3−\mathrm{HCO}_{3}^{-}

    What is the name of this polyatomic ion?

    Answer

    Hydrogen carbonate (bicarbonate)

  45. Card 45

    Question

    What is the formula, including its charge, for acetate?

    Answer

    C2H3O2−\mathrm{C}_{2}\mathrm{H}_{3}\mathrm{O}_{2}^{-}

  46. Card 46

    Question

    What is the formula, including its charge, for cyanide?

    Answer

    CN−\mathrm{CN}^{-}

  47. Card 47

    Question

    ClO4−\mathrm{ClO}_{4}^{-}

    What is the name of this polyatomic ion?

    Answer

    Perchlorate

  48. Card 48

    Question

    HPO42−\mathrm{HPO}_{4}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Hydrogen phosphate

  49. Card 49

    Question

    NH4+\mathrm{NH}_{4}^{+}

    What is the name of this polyatomic ion?

    Answer

    Ammonium

  50. Card 50

    Question

    CrO42−\mathrm{CrO}_{4}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Chromate

  51. Card 51

    Question

    What is the formula, including its charge, for permanganate?

    Answer

    MnO4−\mathrm{MnO}_{4}^{-}

  52. Card 52

    Question

    ClO3−\mathrm{ClO}_{3}^{-}

    What is the name of this polyatomic ion?

    Answer

    Chlorate

  53. Card 53

    Question

    H3O+\mathrm{H}_{3}\mathrm{O}^{+}

    What is the name of this polyatomic ion?

    Answer

    Hydronium

  54. Card 54

    Question

    What is the formula, including its charge, for carbonate?

    Answer

    CO32−\mathrm{CO}_{3}^{2-}

  55. Card 55

    Question

    What is the formula, including its charge, for nitrate?

    Answer

    NO3−\mathrm{NO}_{3}^{-}

  56. Card 56

    Question

    What is the formula, including its charge, for hydroxide?

    Answer

    OH−\mathrm{OH}^{-}

  57. Card 57

    Question

    What is the formula, including its charge, for cyanate?

    Answer

    OCN−\mathrm{OCN}^{-}

  58. Card 58

    Question

    C2O42−\mathrm{C}_{2}\mathrm{O}_{4}^{2-}

    What is the name of this polyatomic ion?

    Answer

    Oxalate

  59. Card 59

    Question

    What is the formula, including its charge, for thiosulfate?

    Answer

    S2O32−\mathrm{S}_{2}\mathrm{O}_{3}^{2-}

  60. Card 60

    Question

    AsO43−\mathrm{AsO}_{4}^{3-}

    What is the name of this polyatomic ion?

    Answer

    Arsenate

Abstract clusters of connected spheres arranged in a balanced chemistry-inspired pattern on a deep blue background.

60 cards

Polyatomic Ion Flashcards: 30 Names, Formulas & Charges

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