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Ch. 14 vocab.

Physical properties

Characteristics of matter that can be seen through direct observation such as density, melting point, and boiling point.

Chemical properties

Characteristics of matter that can only observed when one substances changes into a different substance, such as iron into rust.

Periodic table

A chart that organizes the elements by their chemical properties and increasing atomic number.

Period

A row of the periodic table.

Group

A column of the periodic table.

Metal

Elements that are typically shiny and good conductors of heat and electricity.

Nonmetal

Elements that are poor conductors of heat and electricity.

Atomic mass unit

A unit of mass equal to 1.66 * 10^-24 grams, which is one twelfth the mass of the isotope carbon-12.

Atomic mass

The average mass of all the known isotopes of an element, expressed in amu.

Alkali metals

Elements in the first group of the periodic table.

Halogens

Elements in the group containing fluorine, chlorine, and bromine, among others.

Noble gases

Elements in the group containing helium, neon, and argon, among others.

Periodicity

The repeating pattern of chemical and physical properties of the elements.

Electrical conductor

A material that allows electricity to flow through easily.

Thermal conductor

A material that allows heat to flow easily.

Steel

An alloy of iron and carbon.

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