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20 terms

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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