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9Sci CH12

9th Science CH12 Elements and Their Properties

TermDefinition
allotrope different structural forms of the same element; for example, some carbon molecules form soft graphite, whereas others form hard diamonds
diatomic molecule a molecule composed of two atoms of the same element
ductile ability of metals to be pulled into wires
malleable ability of metals to be hammered or rolled into thin sheets
metallic bonding the type of chemical bond in which positively charged ions are surrounded by freely moving electrons; metallic bonding holds metals together
radioactive element an unstable element whose nucleus breaks down and gives off particles, radiation, and energy
semiconductor an element that conducts electricity under certain conditions
sublimation the process in which a solid changes directly into a vapor without forming a liquid
transition element an element in Groups 3-12 of the periodic table; typically these are metals with one or two electrons in their outer energy level
transuranium element any element having more than 92 protons, the atomic number of uranium