Polyatomic Ions Flashcards

Printable polyatomic ion worksheets and flashcards

Six worksheets per set, each with an answer key on its own page. Pick a set, pick a sheet, print it. There is no sign-up and no download step, and the key is a link away rather than a separate file to keep track of.

Each worksheet runs the ions both directions. The first table gives you the formula and asks for the name and charge. The second gives you the name and asks for the formula. That matters more than it sounds: recognising sulfate when you see SO₄^2- is a different skill from producing SO₄^2- when you read the word, and students who only ever practise the first direction get caught out writing formulas.

Which set to print

The 20 you need first is the intersection of what several common syllabuses examine. If you are starting from nothing, print this one and nothing else until it is solid.

Charge 1-, 2- and 3- group the ions by charge. These are useful late in revision, when the names are secure and the charges are what keep slipping. Grouping them this way makes the pattern visible: the 3- ions are almost all phosphates and arsenates, and there are fewer of them than students expect.

The -ate and -ite pairs is the set to print if you keep confusing sulfate with sulfite or chlorate with chlorite. Every ion on it belongs to a family, so working through it once makes the ladder obvious.

Every ion in the table is the full set, for a final pass.

Sheets do not change

Worksheet 3 today is worksheet 3 next term. The sheets are fixed, not generated fresh on each visit, so a teacher can set sheet 3 in September and print its answer key in October and get the same twenty ions.

The six sheets within a set draw different ions from the same pool, so a class can work through the set without repeating, and a student who has already done sheet 1 has something new to do.

Using these in a classroom

The sheets print without site navigation, without the drill and without ads. What comes out of the printer is a worksheet.

The answer key prints separately, on a link marked on every sheet, which means you can put the worksheet in front of a class without handing over the answers at the same time. Both pages carry the URL in the footer, so a student who loses the paper copy can find it again.

There is no licence to read. Print them, photocopy them, put them in a pack. Attribution is welcome and not required.

Making flashcards from a sheet

Cut the first table into rows and you have cards with the formula on one side. Fold each row so the name column sits behind the formula column and the card tests itself.

Physical cards beat an app for one specific reason: you can put the ones you keep missing in a separate pile and work only on those. That pile is the whole point, and it is the same idea the online drill uses when it shows you the ions you keep getting wrong more often than the ones you have learned.

A printed sheet and a drill do different jobs

Paper is better for the first pass, because writing a formula by hand is slower than typing it and the extra time is where the learning happens. It is also the only option in an exam, where you will be writing subscripts rather than selecting them.

The online drill is better for the tenth pass. It marks instantly, it explains what went wrong rather than showing a cross, and it tracks which ions you keep missing so it can ask about those more often. A worksheet cannot do any of that.

Most students should use both: a printed sheet to learn the table, then the drill to find the gaps.

Where to go next

For the full reference, including a common salt for each ion, see the complete list of polyatomic ions. Once the ions are secure, move on to naming ionic compounds and the ionic compound formula writer.

33Science also publishes a list of binary compounds, a list of chemical compounds and an explanation of how ionic bonds work.

Common questions

Are these free to use in class?

Yes. Print, photocopy and distribute them freely.

Where is the answer key?

Linked from every worksheet, above the sheet itself. It opens as its own printable page covering the same ions in the same order.

Can I get a PDF?

Use your browser’s print dialogue and choose “Save as PDF” as the destination. The print layout is already stripped of navigation and ads, so the PDF matches what the printer would produce.

How many ions are on a sheet?

Twenty, in both directions, which fits on one side of A4 or US Letter with room to write.