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Periodic Table Crossword Puzzle

Across
A substance that can be separated into simpler substances only by chemical reactions.
The smallest particle of an element that retains the properties of that element.
Any metal in Group 1A of the periodic table.
The weighted average of the masses of the isotopes of an element.
Any metal in Group 2A of the periodic table.
A substance that cannot be changed into a simpler substance under normal laboratory conditions.
A horizontal row of elements on the Periodic table.
One of the class of elements that are not lustrous and are generally poor conductors of heat and electricity. They are grouped on the right side of the Periodic table.
Down
One of the class of elements having properties of both a metal and nonmetal.
Any member of a group of gaseous elements in Group 0 of the Periodic table. The s and p sub levels of their outermost energy level are filled.
The number of protons in the nucleus of an atom of an element.
An element found in one of the B groups in the Periodic table.
A vertical column of elements in the periodic table; the constituent elements of a group have similar chemical and physical properties.
Any member of the nonmetallic elements in Group 7A of the periodic table.
One of a class of elements that includes a large majority of the known elements, also lustrous, malleable, ductile and good conductors of heat and electricity.