261Graphite, a common allotrope of carbon, is unusual among nonmetals because it can do what?
262Unlike graphite, diamond does not conduct electricity mainly because it lacks what?
263What is the atomic number of oxygen?
264What is the atomic number of chlorine?
265What is the atomic number of helium?
266Helium is generally considered the second lightest element after which one?
267Neon, argon, krypton, xenon, and radon belong to which category of elements along with helium?
268Which noble gas is commonly used to fill glowing signs and advertising lights?
269Which metal is well known for being liquid at normal room temperature?
270Which nonmetal element is well known for being liquid at normal room temperature?
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