Final answer:
The true statements regarding metals and nonmetals are: (A) Most metals are grey or silvery in color, (B) Nitrogen, oxygen, and helium are all gases at room temperature, and (E) Most metals are solids.
Step-by-step explanation:
The question asks us to determine the true statements about metals and nonmetals. Metals are distinguished by being good conductors of heat and electricity, malleable, ductile, and typically having a shiny appearance or luster. Furthermore, most metals are indeed solid at room temperature, with mercury being a notable exception. Nonmetals, on the other hand, are often poor conductors of heat and electricity, and solid nonmetals are brittle. Nonmetals can exist in solid, liquid, or gas states at room temperature.
To answer the question:
A. Most metals are grey or silvery in color. - This statement is true; however, metals can also have other colors, though grey or silvery is typical.
B. Nitrogen, oxygen, and helium are all gases at room temperature. - This is true as all three mentioned elements are indeed gases under standard room conditions.
C. Nonmetals conduct electricity if they are in the solid state. - This is generally false as nonmetals are poor conductors with the exception of graphite, a form of carbon.
D. Nonmetals can be bent and shaped. - Generally false, as nonmetals are usually brittle in solid form and cannot be bent or shaped like metals.
E. Most metals are solids. - This is true, as nearly all metals are solid at room temperature with mercury as an exception.