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Unit 3

Lesson 1

TermDefinition
atom the smallest particle into which an element can be divided and still be the same element
electron negatively charged particles that move around the nucleus
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons
proton a positively charged particle in the nucleus
neutron uncharged particles in the nucleus
electron cloud the electrons don't have an exact speed that they move at so scientists think that they are in an electron cloud
atomic number the number of protons in the nucleus of an atom
mass number the total number of protons and neutrons in an atom's nucleus
Periodic table An arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column, or group
Chemical symbol An abbreviation for the chemical's name
Average atomic mass The weighted average of the masses of all the naturally occurring isotopes of that element
Metals Elements that are shiny and conduct heat and electricity well
Nonmetals Poor conductors of heat and electricity
Metalloids Elements that have some properties of metals and some properties of nonmetals
Group Each vertical column of elements on the periodic table
Period Each horizontal row of elements on the periodic table
chemical bond an interaction that holds atoms or ions together
valence electron electrons found in the outermost energy level of an atom
ion a particle with a positive or negative charge
ionic bond a force that brings oppositely charge ions together
covalent bond forms when atoms share one or more pairs of electrons
molecule a group of atoms held together by chemical bonds
metallic bond forms between metal atoms when their outermost energy levels overlap
Created by: 19carrollk1107
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