THE PERIODIC TABLE VOCABULARY Quiz-11/7/2010

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Atom

The smallest particle into which an element can be divided and still be the same substance

Electron

The negatively charged particles found in all atoms

Nucleus

The tiny, extremely dense, positively charged region in the center of an atom

Electron clouds

the regions inside an atom where electrons are likely to be found

Protons

The positively charged particles of the nucleus

Neutrons

The particles of the nucleus that have no charge

Atomic number

The number of protons in the nucleus of an atom.

Protons and Electrons

A neutral atom has an equal number of ________ and ________.

Periods

The horizontal rows of elements in the periodic table

Groups or Family

Vertical columns on periodic table

Theory

A unifying explanation for a broad range of hypotheses and observations that have been supported by testing

Model

A representation of an object or system

Isotopes

Atoms that have the same number of protons but have different numbers of neutrons

Mass number, Atomic Mass Unit ,AMU or Atomic Weight

The sum of the protons and neutrons in an atom

PERIODIC TABLE OF ELEMENTS

A CHART THAT ORGANIZES ALL KNOWN ELEMENTS INTO A GRID OF HORIZONTAL ROWS (PERIODS) AND VERTICAL COLUMNS (GROUPS OR FAMILIES) ARRANGED BY INCREASING ATOMIC NUMBER

Elements

A pure substance that is made up of only one kind of atom

Dmitri Mendeleev

Created the first periodic table, arranged elements by increasing atomic mass

Chemistry

The study of matter and the changes that it undergoes

Subatomic Particles

Particles found within the atom, mainly protons, neutrons, and electrons.

Chemical Symbol

A one or two letter representation of an element

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