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اختبار الجدول الدوري
اختبر نفسك على جميع 118 عنصرًا في أربعة اتجاهات، مع إجابات خاطئة معقولة.
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Final score
How to use it
- A quiz starts straight away with the first twenty elements.
- Change what is tested, how far up the table it goes, and the length - a fixed count, a 1- or 2-minute timer, or endless until you stop.
- Answer by picking an option, or switch to typing if you want it harder.
- At the end, read the list of the ones you missed, retry just those, or see if you beat your best for that combination.
Four directions, because they are not the same skill
Recognising that Fe is iron is easier than producing Fe when you are given iron, and both are different again from knowing that iron is number 26. Recognition is prompted; recall is not. Testing all four directions is what turns a vague familiarity into something you can use in an exam.
symbol → name Fe → Iron easiest: recognition name → symbol Iron → Fe recall, and where Latin names bite number → name 26 → Iron needs the ordering, not just the name name → number Iron → 26 hardest of the four
A multiple-choice question is only as good as its distractors. Pick them uniformly at random from all 118 elements and most questions collapse: you rarely need to know the answer, only to spot that three of the options are obviously from the wrong part of the table. So the three alternatives here come from the same family as the answer first, ordered by how close their atomic numbers are, and only fall back to nearest-by-number if the family is too small. In practice that means a question about neodymium offers you praseodymium, promethium and samarium - its actual neighbours - rather than helium, sodium and chlorine. The options themselves are shuffled with Fisher–Yates, not the one-liner sort(Math.random() - 0.5) that most quiz code reaches for - that naive version is measurably biased, and over 200,000 runs it puts the first item in the first slot 36.2% of the time instead of a fair 25%. Since the correct answer starts first in the list before shuffling, that bias would be an exploitable pattern within ten questions.
FAQ
Which elements should I learn first?
The first twenty, and then the ones whose symbols do not match their English names - iron is Fe, sodium is Na, potassium is K, lead is Pb, gold is Au, silver is Ag, tin is Sn, mercury is Hg. Those are the ones that cost marks, because you cannot guess them from the name.
Why are the wrong answers so plausible?
Deliberately. The three alternatives are drawn from the same family as the answer and from elements with nearby atomic numbers, so you have to actually know it. A question where the answer is a lanthanide and the other options are a noble gas, an alkali metal and a halogen answers itself.
Does capitalisation matter when I type a symbol?
The quiz accepts either, but chemistry does not, and it tells you when you have slipped. Co is cobalt; CO is carbon monoxide. A symbol is always a capital, optionally followed by one lower-case letter, and getting that wrong changes what you have written into something else entirely.
Are the answer options in a random order?
Yes, genuinely random. That sounds trivial but it is the most common bug in quiz code - the one-line shuffle that sorts by a random comparator is measurably biased, and over 200,000 runs it leaves the first item in first place 36% of the time instead of 25%. Since the correct answer starts first in the list, that would be an exploitable pattern.
Is my score saved?
Your best result for each combination of test, range and length is saved in your browser - nothing is sent anywhere, and reloading the page will not lose it. A specific run itself is not saved: the review list at the end is there so you can see what you missed before it disappears.
What are the timed and endless modes?
Alongside a fixed 10, 20 or 40 questions, you can play a 1- or 2-minute countdown, or an endless run that only ends when you click Stop. A question you have not yet answered when time runs out is not counted either way. Endless mode tracks your longest correct streak rather than a total, since how long you choose to keep playing is not a fair thing to compare.
What does "Retry just what you missed" do?
It starts a new quiz using only the elements you got wrong last time, in the same test direction and answer style. It is not spaced repetition - there is no scheduling across days - but it is the fastest way to hammer on exactly your weak spots right away.
Why does it say aluminium and caesium?
Those are the IUPAC spellings. Aluminum and cesium are the American variants of the same elements, and if you are typing answers either spelling is a reasonable thing to know - the multiple-choice mode sidesteps the question entirely.
Is this periodic table quiz free, and do I need to sign up?
Yes, it is free with no account, no sign-up, and no ads - it runs entirely in your browser. The only thing saved locally is your best score for each combination of test, range and length, so it is there again the next time you visit.
Can I test only some elements, like just the first 20?
Yes - the range control lets you limit the quiz to the first 20 elements (the ones usually memorised first), the first 54 (up to xenon), or all 118. Combine that with any of the four test directions and any length or timer setting.
How we compare
| Feature | Online Tool Store | Free quiz sites | Flashcard apps |
|---|---|---|---|
| All four question directions | ✓ | Usually one or two | ✓ |
| Distractors from the same family | ✓ | ✗ | No options at all |
| Choose the range and length | ✓ | Often fixed | ✓ |
| No signup, no ads, no tracking | ✓ | ✗ | ✗ |
| Review of what you missed | ✓ | Sometimes | ✓ |
| Best score kept between visits, with no account | ✓ | Leaderboards need an account; per-device best is rare | ✓ |
| Timed and endless modes, with a tracked streak or high score | ✓ | Confirmed on periodictable.one; varies elsewhere | ✗ |
| Retry just the elements you missed, immediately | ✓ | ✗ | Full spaced repetition instead - scheduled over days, not immediate |
Open it and you are answering questions in a second, with alternatives chosen to make you think and no account in the way, and it remembers your best for each combination without one. What it does not do is schedule your weak elements back to you over the following weeks - for that kind of long revision campaign, a spaced-repetition app is the better tool, and this is the thing you use the night before, or to hammer a weak spot right now with "retry just what you missed."