Which is a true statement about dmitri mendeleev? a. mendeleev created the periodic table in the 1860s. b. mendeleev grouped the known elements into four categories: metals, nonmetals, gases, and earths. c. mendeleev identified the first 17 elements of the periodic table. d. mendeleev organized the elements of the periodic table in the order of decreasing mass.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.

Categorize them by metal, nonmetal, in periodic tableductilenon-ductilemalleableoft en gain electrons easilygood conductorpoor conductorcan be liquidselements