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A Bohr model of an atom, a beaker, an Erlenmeyer flask, and a molecular structure model are grouped together.

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Hydrogen starts the clock, but Oganesson ends the race. You’ve memorized the symbols and tracked the noble gases, but can you spot the metalloids under pressure? Prove you own the groups and periods before the timer runs out. Stack your wins one element at a time.

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A graphic featuring an orange diagram of concentric circles, a black rock, a stylized sun, and yellow crystals.
A person in a thinking pose surrounded by scientific icons including an atom, a molecular structure, and laboratory glassware.
A test tube with orange liquid, a molecular model, purple crystals, and an Erlenmeyer flask.
A vacuum tube, an Erlenmeyer flask with orange liquid, an atom model, and a balloon.
A baseball bat, an atomic model, a crystal, stacked bowls, dark blocks, and a flask with liquid.

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