Atomic Nature of Matter (Glencoe)

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chemical symbol

an abbreviated way to write the name of an element

nucleus

positively charged center of an atom

electron

negatively charged particles that move around the nucleus of an atom

proton

atomic particle with a positive charge, found in nucleus

neutron

an atomic particle with no charge, found in nucleus

atomic number

the number of protons in the nucleus

electron cloud

the region forned by electrons

quark

particle that makes up protons and neutrons

mass number

the total number of protons and neutrons in the nucleus

isotope

any of two or more atoms of the same element with a different number of neutrons

average atomic mass

average mass of the mixture of isotopes

periodic table

a table of the elements arranged according to repeated changes in properties

group

a vertical row in the periodic table

period

a horizontal row in the periodic table

Al

aluminum

Ca

calcium

Cl

chlorine

F

Fluorine

H

hydrogen

Mg

magnesium

Hg

mercury

N

nitrogen

K

potassium

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