How many elements can you name without being prompted?
Rebuild the periodic table from memory by typing element names or chemical symbols in any order. Start with elements 1–20, expand through 54, or attempt the complete 118-element table. Use Endless Recall when completion matters or the 60-second Sprint when you want a short free-recall test.
Name all the elements from memory
The V0.149 Recall Board is an additive layer over the existing Periodic Table specialist. The older Learn Table, Symbol → Name, Name → Symbol, Atomic Number, Position, Mixed 10, Weak Review and date-stable Daily 10 remain available. Free recall answers a different question: what can you produce when the app does not tell you which element to retrieve?
Open recall is different from answering 118 questions
A standard periodic-table quiz chooses a target and asks you to retrieve one fact. That is useful because every question has a clear right answer and missed prompts can feed a Weak Review queue. Open recall removes the target. You begin with a blank table and produce whichever elements come to mind. Hydrogen can be followed by iron, xenon, carbon or any other in-scope element. The challenge is not merely recognizing the answer to a prompt; it is searching your own memory for the set.
DailyBrainArc keeps both styles because they reveal different gaps. Prompted recall can show that you repeatedly miss the symbol for antimony. Free recall can show that an entire region of the table never comes to mind until the run ends. The V0.149 board does not merge those observations into a mysterious score. It keeps the older prompted-question statistics intact and records free-recall runs separately.
Endless Recall: rebuild a scope completely
Endless Recall has no fixed time limit. Choose Foundations for elements 1 through 20, Core for 1 through 54, or Full for all 118. Start the run and type any element name or symbol. Every first unique match fills the element's real table position. The board therefore gives spatial feedback as your memory list grows without displaying the names you have not yet retrieved.
A clean completion means every element in the selected scope was recalled without using Reveal One. Clean completions can set a browser-local personal best based on active recall time. This is only a record for your own practice on this device. It is not a population percentile, school grade, chemistry certification or claim that faster completion is universally better.
60-second Sprint: free recall under a short clock
The Sprint uses the same open-answer rule but stops after 60 seconds of active play. The goal is simply to recall as many unique in-scope elements as you can before time expires. A correct answer fills the board and increases the recalled count. Repeating an element does not add a second point. An invalid entry is explained but does not create an arbitrary negative score.
The local Sprint best favors a larger unique recalled count. If two clean runs reach the same count, the shorter active time can break the tie when a run ends early by completing the scope. Reveal One remains available as a learning aid, but using it marks the run Assisted and prevents that attempt from replacing a clean personal best.
Type a name or a chemical symbol
The board accepts the canonical English element name or chemical symbol from the project's frozen 118-element source. Symbols are matched without requiring you to reproduce capitalization exactly, so Fe and fe both resolve to iron. The same compatibility already used by the older Periodic Table quiz is preserved for aluminium/aluminum and caesium/cesium.
The scope rule is explicit. If you choose Foundations and type xenon, the app can identify xenon but tells you that it sits outside the current 1–20 scope. It does not secretly count the answer, and it does not call it wrong chemistry. Changing to Core or Full gives that element a place in the run.
The blank table is a memory cue, not an answer sheet
During a run, unfilled in-scope cells do not show their atomic numbers, names or symbols. Their positions remain visible so the periodic structure itself can act as a retrieval cue. When you recall an element, its atomic number, symbol and name appear in the correct cell. Lanthanides and actinides use the same detached rows as the established DailyBrainArc table rather than forcing a disputed group-3 convention into the exercise.
This spatial reconstruction complements the existing Position mode. Position mode gives you an element and asks where it belongs. Open recall works in the opposite direction: you supply the element and watch the structure emerge from memory. Someone can therefore practice both element-to-position and self-generated table reconstruction without duplicating the underlying data authority.
Reveal One is help, so the run says so
Getting stuck should not require abandoning a learning session. Reveal One fills the next unrecalled element in atomic-number order and identifies it immediately. The run then becomes Assisted. You can continue recalling other elements, and if you later type the revealed element yourself it moves into your recalled count, but the run remains Assisted because help was used.
That distinction protects the meaning of a clean PB without punishing help. The assisted result still appears in recent local history and can still finish the board. It simply cannot overwrite a record that was completed without a reveal.
Why unrecalled elements are not automatically “Weak Facts”
At the end of a free-recall run, the board lists the elements that were not produced. Those gaps are useful review material, but they are not identical to a wrong answer. A learner may stop early, run out of time, or intentionally practice only part of a scope. V0.149 therefore does not inject every unfilled cell into the existing Weak Review statistics.
The older Weak Review remains based on actual prompted questions that were answered incorrectly. If you want precise element-by-element error history, use Symbol → Name, Name → Symbol, Atomic Number, Position or Mixed 10. If you want to see what comes to mind without prompts, use the Recall Board. Keeping the two evidence types separate avoids overstating what one incomplete run proves.
Three scopes let the same rule grow with you
Foundations uses atomic numbers 1–20. It is small enough to learn as a coherent first set and includes the first four periods through calcium. Core extends the same interaction through element 54, xenon, adding the full fourth period and most of the fifth. Full includes all 118 records, including the detached f-block rows and the superheavy elements through oganesson.
The answer rule does not change between scopes. This matters because progression should come from a larger memory set rather than from hidden scoring changes. A learner can build confidence on 1–20, repeat the exact same interaction on 1–54, and finally attempt 1–118.
Use prompted practice when you need directed repair
Free recall is strongest when paired with targeted practice. After a run, look at the gap list and choose the older mode that matches the problem. If names are familiar but symbols are weak, use Name → Symbol. If you recognize symbols but cannot produce names, use Symbol → Name. If a whole region feels spatially uncertain, use Position. Mixed 10 interleaves those retrieval directions, while Weak Review prioritizes elements with real saved misses.
This creates a practical loop: free recall to expose what does not surface easily, directed quizzes to repair specific associations, then another free-recall attempt to see whether the repaired items now emerge without a prompt. No single mode has to pretend to be a complete chemistry course.
Stable identity data, narrow claims
The V0.149 layer does not introduce a second hand-written element list. It uses the same frozen 118-element records already established for the Periodic Table specialist. Those records contain atomic number, symbol, name and display position information. An independent verifier hard-locks the inherited data and quiz-engine hashes before testing the new name/symbol lookup, scope boundaries, duplicate handling, reveal logic and personal-best rules.
The product deliberately avoids unstable or unnecessary claims about properties that are not part of this recall task. It also does not label a result as an IQ score, clinical measure, grade-level equivalence or permanent mastery. A run says what happened in that run: how many in-scope elements were recalled, whether help was used, how long active recall took, and which cells remained unfilled.
A practical 10-minute chemistry routine
Begin with a Full Endless Recall and stop when retrieval slows down. Read the gap list once. Open a prompted mode for five to ten targeted questions or use Weak Review if actual misses already exist. Then run a 60-second Sprint and try to retrieve the repaired elements early. On another day, repeat the full board. This alternates self-generated recall with directed correction rather than grinding the same question format.
If all 118 is currently too large, run the exact same loop with Foundations or Core. The important part is not the absolute number; it is producing answers, checking them against stable element identity data, and revisiting the associations that did not come back easily.