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Chem Test Ch 9, 10

Chemistry Test Chapter 9,10

alkali metals group 1 and most reactive metal on the periodic table
alkaline earth metals group 2 and is a valence electron
group a column on the periodic table
metals an element that is shiny, easily pulled into wires or hammered into thin sheets, and a good conductor of electricity and thermal energy
period a row on the periodic table
transition elements an element in groups 3-12 on the periodic table
noble gases least reactive gas and is in group 18
atom a small particle that is the building block of matter, and is the smallest piece of an element that still represents that element
atomic number the number of protons in an atom of an element
atomic mass amount of mass in an object
ion an atom that is no longer neutral because it has lost or gained valence electrons
neutron a neutral particle in the nucleus of an atom
average atomic mass the average mass of the element's isotopes, and is weighted according to the abundance of each isotope
iosotopes atoms of the same element that have different numbers of neutrons
nucleus the region in the center of an atom where most of an atom's mass and positive charge are concentrated
elements a substance that consists of only one type of atom
protons positively charged particle in the nucleus of an atom
radioactivity any element that spontaneously emits radiation
electrons a negatively charged particle that occupies the space in an atom outside the nucleus
Created by: 2018grellerj



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