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Unit 3

Atoms and the Periodic Table

TermDefinition
Atom Smallest particle into which an element can be divided and still be the same element.
Electron Negatively charged particles.
Nucleus Small dense center that has a positive charge and is surrounded by moving electrons.
Proton Positively charged particles in the nucleus.
Neutron Particles that have no charge and are neutral.
Electron Cloud Area around the nucleus that electrons move.
Atomic Number Number of protons in the nucleus of the atom.
Mass Number Total number of protons and neutrons in an atom.
Periodic Table Mendeleev's arrangement of elements.
Average Atomic Mass Weighted average of the masses of all the naturally occurring isotopes of that element.
Chemical Symbol Abbreviation for the element's name.
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 of nonmetals.
Group Vertical column of elements.
Period Horizontal row of elements.
Created by: 18ttice0822
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