Chapter 3 and 4 Science

average mass of an atom of an element; its unit of measure is the atomic mass unit (u), which is 1/12 the mass of a carbon-12

number of protons in the nucleus of each atom of a given element; is the top number in the periodic table

a substance produced when elements combine and whos properties are different from each of the elements in it

natural or synthetic material that cannot be broken down into simpler materials by ordinary means; has unique properties and is generally classified as a metal, metalloid, or nonmetal

two or more atoms of the same element that have different numbers of neutrons in their nuclei

sum of the number of protons and neutrons in the nucleus of an atom

anything that takes up space and has mass

element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster

element that has charactisics of both metals and nonmetals and is solid at room temperature

a combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixture's identity

elements that are usually gases or brittle solids and poor conductors of electricity and hear; are the basis of the chemicals of life

matter with a fixed composition whose identity can be changed by chemical processes but not by ordinary physical processes

change of matter from a gas to a liquid state

matter that does not have a difinite shape or volume; has particles that move at high speeds in all directions

matter with a definite volume but no definite shape that can flow from one place to another

matter with a definite shape and volume; has tightly packed particles that move mainly by vibrating

the uneven forces acting on the particles on the surface of a liquid

change of matter from a liquid state to a gas

a liquid's resistance to flow