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13 December, 12:51

At STP, which list of elements contains a solid, a liquid, and a gas?

(1) Hf, Hg, He (3) Ba, Br2, B

(2) Cr, Cl2, C (4) Se, Sn, Sr

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  1. 13 December, 12:59
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    The answer is (1). Hf is solid, Hg is liquid, and He is gaseous. You can look up a periodic table online that shows each element's state of matter at STP.
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