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Atoms and PT

Reimer Atoms and Periodic Table Study Guide - 8th

matter anything that has mass and takes up space
atom small particle that makes up most types of matter and is made up of smaller particles called protons, neutrons and electrons
law of conservation of matter states that matter is neither created nor destroyed, only changed in form
electron negatively charged particle only changed in form
nucleus central part of the atom
proton positively charged, heavy particle contained in the nucleus of all atoms
neutron neutral particle that is present in the nucleus of all atoms (has the same mass as the proton)
element a substance that can not be broken down into smaller substances
electron cloud region surrounding the nucleus of an atom
atomic number number of protons in the nucleus of an atom; whole number that tells how many protons are in the nucleus of each atom of an element
atomic mass number of neutrons plus the number of protons in the nucleus of an atom
isotope atoms of the same element that have different numbers of neutrons in the nuclei
radioactive decay release of nuclear particles and energy from unstable atomic nuclei
half-life time needed for one-half the mass of a sample of a radioactive isotope to decay; can vary from fractions of a second to billions of years
periodic table a chart in chemistry that lists the elements in order on increasing atomic number
period a horizontal row on the periodic table
group (or family) a vertical column on the periodic table
metal element that is a good conductor of electricity and heat, is usually a solid at room temperature and usually is shiny, ductile, and malleable
non-metal element that is a poor conductor of heat and electricity and may be a gas or a brittle solid at room temperature
metalloid element that shares some properties with metals and nonmetals
Created by: rcorippo