Deduction, not multiple choice

Element decoder

One element is hidden. You get two clues for free; every extra clue costs points. Everything you are told is real measured data — so the reasoning that wins is the reasoning that reads a periodic table.

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    How to get good at it

    Three habits that beat guessing

    01

    State narrows it fast

    Only eleven elements are gases at room temperature and only two are liquids. “It is a gas” cuts 118 possibilities down to eleven before you have spent a single point.

    02

    Mass locates it

    Atomic weight is roughly 2× the atomic number for light elements, drifting toward 2.5× past iron. A mass of 56 puts you within a couple of squares of element 26 — iron.

    03

    Guess to triangulate

    A wrong guess is not wasted: you are told whether the answer is heavier or lighter, and whether you landed in the right family, period or group. Two well-chosen wrong answers usually beat two bought clues.

    Need the reference?

    No shame in it. The table is right there, and everything the game tells you is on it.