Which change occurs when an atom in an excited state returns to the ground state?*

The valence electrons in an atom of phosphorus in the ground state are all found in*

Which two elements have the most similar chemical properties?*

Which phrase describes a compound that consists of two elements?*

The formula mass of a compound is the*

The arrangement of the elements from left to right in Period 4 on the Periodic Table is based on*

Which diatomic molecule is formed when the two atoms share six electrons?*

Which formula represents a polar molecule?*

Which element is least likely to undergo a chemical reaction?*

Which element has a melting point higher than the melting point of rhenium?*

Which property can be defined as the ability of a substance to be hammered into thin sheets?*

Which list of elements consists of a metal, a metalloid, and a noble gas?*

Which sample of matter has a crystal structure?*

One mole of liquid water and one mole of solid water have different*

Which substance can not be broken down by a chemical change?*