Unit 2 Section A Vocabulary Flashcard

physical property
a property that can be observed or measured without changing the identity of the sample of mater
physical change
a change in matter in which the identity of the material involved does not change
chemical change
an interaction of matter that results in the formation of one or more new substances
chemical properties
properties only observed or measured by changing the chemical identity of a sample of matter
combustion
a chemical reaction with oxygen gas that produces thermal energy and light: burning
luster
the reflection of light from the surface of a material
ductile (ductility)
a property of a material that permits it to be stetted into a wire without breaking
metal
a material possessing properties such as luster, ductility, conductivity, and malleability
nonmetal
a material possessing properties such as brittleness, lack of luster, an non conductivity; nonmetals are often insulators
metalloids
a material with properties intermediate between those of metals and nonmetals
conductor
a material that allows electricity (or thermal energy) to flow through it
nonconductor
a material that does not allow electrical current (or thermal energy) to flow through it
malleable
the property of a material that permits it to be flattened without shattering
brittle
a property of a material that causes it to shatter under pressure
atomic number
the number of protons in an atom; this value distinguishes atoms of different elements
nucleus
the dense, positively charged central region of an atom that contains protons and neutrons
mass number
the sum of the number of protons and neutrons in the nucleus of an atom of a particular isotope
isotopes
atoms of the same element with differing numbers of neutrons
period
a horizontal row of elements in the periodic table
periodic relationship
regular patterns among chemical and physical properties of elements arrayed in the periodic table
group
a vertical column of elements in the periodic table; also called a family; group members share similar properties
family
a vertical column of elements in the periodic table; also called a group; family members share similar properties
alkali metal family
the group of elements consisting of lithium, sodium, potassium, rubidium, cesium, and francium
noble gas family
an unreactive element belonging to the last (right-most) group on the periodic table
halogen family
the group of elements consisting of fluorine, chlorine, bromine, iodine, and astatine

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