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Science Terms Chapter 2

alkali metals Group 1 metallic elements (Lithium, sodium, potassium, rubidium, cesium, francium) are all strongly reactive soft, low-density metals
alkaline earth metals Group 2 elements (beryllium, magnesium, calcium, strontium, barium, radium) are all reactive soft, low-density metals
atomic mass the mass of an average atom of an element
atomic number the number of protons in each atom of an element
Bohr model the diagram of the atom that describes the arrangement of subatomic particles
chemical symbol international symbols for each element consisting of one or two letters
electron shell regions surrounding the nucleus of an atom in which electrons move
halogens Group 17 non-metallic elements (fluorine, Chlorine, bromine, iodine, astatine)
metal elements that are good conductors of heat and electricity
metalloid elements that share some properties with metals and some properties with non-metals
multiple ion charge a character of elements that can form ions in more than one way
noble gases Group 18 elements (Helium, neon, argon, krypton, xenon, radon)
non-metal elements that are typically poor conductors of heat and electricity
valence electron electrons in the outer shell of the atom which determine its ability to combine with another atom
valence shell the outermost electron shell
Created by: JaxsonG