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Unit 3

Atom The smallest particle into which an element can be divided and still and still be the same element
electrons particles within the atom that have a negative charge
nucleus a small dense center of an atom that has a positive charge and is surrounded by moving electrons
protons positive charged particles in the nucleus
neutrons uncharged particles in the nucleus of an atom
electron cloud a region around the nucleus of an atom where electrons are likely to be found
atomic number the number of protons in the nucleus of an atom
mass number the total number of protons and neutrons in an atoms nucleus
Periodic table Periodic table An arrangement of elements on a table created by Dmitri Mendeleev
Chemical symbol An abbreviation of an elements name
Average atomic mass The weighted average of the masses of all the naturally occurring isotopes of that element
group Each vertical column of elements on the periodic table
metal Elements that are shinny and conduct heat and electricity well
period Each horizontal row of elements on the periodic table
nonmetal Elements that are poor conductors of heat and electricity
meataloid Elements that have some properties of metals and nonmetals
Chemical bonds an interaction that holds atoms or ions together
Valence Electron Electrons on the outermost energy level of an atom
Ion a particle with a negative or positive charge
Molecule A group of atoms held together by chemical bonds
Ionic Bond A force that brings oppositely charged ions together
Corvalent Bond Forms when atoms share one or more pairs of electrons
Metallic Bond Forms between metal atoms when their outermost energy levels overlap
Created by: floresj



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