You are watching: 11 elements that are gases at room temperature
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Periodic Table – BlocksElements can be classified by the last energy level that their electrons fill. There are 4 types of electron orbitals (s, p, d & f) and where these orbitals are on the periodic table.
Periodic Table - State at 298 K Elements can be classified by their state at room temperature (298 K). Most elements are solid at room temperature but there are 2 elements that are liquid and 11 elements that are gases at 298 K.
Hydrogen (H), Helium (He), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne), Chlorine (Cl), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn) are all gases at room temperature. Mercury (Hg) & Bromine (Br) are liquid at room temperature. All remaining elements are solid at room temperature.
Periodic Table - Metallic Character Elements can be classified by their metallic character as being a metal, metalloid (semi-metal) or nonmetal. Metals include all elements that are not considered a metalloid or nonmetal. Metals have the following properties: Shiny metallic appearance. Solid at room temperature (except Mercury). High melting point. High densities. Malleable & ductile. Good conductors of heat & electricity. Metalloids (also known as semi-metals) include Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te) and Astatine (At). Metalloids have the following properties: Have properties of both metals and nonmetals. Often used as semiconductors. Nonmetals include all elements to the right of the metalloids and Hydrogen (H). Nonmetals have the following properties: Solid nonmetals have little to no metallic luster. Solid nonmetals are brittle. High ionization energy. Poor conductors of heat & electricity. Periodic Table - Groups The elements of the periodic table can also be classified by groups of similar properties.