교과서 질문
At room temperature, a certain element is found to be a soft, silver-colored solid that reacts violently with water and is a good conductor of electricity. Is the element likely to be a metal, a nonmetal, or a semimetal?
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검증된 단계별 안내
(b) Without looking at a periodic table, list as many alkaline earth metals as you can. (There are five common ones.)
(a) Without looking at a periodic table, list as many alkali metals as you can. (There are five common ones.)