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Across
2.has a unique atomic number on the periodic table.
5.containing two or more different atoms bound together.
7.horizontal row of elements in the periodic table
10.one of the elements of group 18 of the periodic table
12.form of matter which has a definite shape and volume
13.usually dull in appearance, poor conductors of heat and electricity,
14.the same vertical column of the periodic table; also called a group
15.has mass, occupies a volume, and flows to adopt the shape of its container.
17.one of two or more atoms with the same atomic number
18.In the nucleus of an atom it is stable
19.sum of the number of neutrons and protons in an atomic nucleus
20.chart of the elements showing the repeating pattern of their properties
Down
1.orbiting the nucleus in numbers equal to the atomic number
3.shiny or metallic luster, good conductors of heat and electricity
4.smallest unit of matter that can exist of an element
6.equal to the atomic number
8.can be either compressed or expanded to fill an infinite volume.
9.elements that have characteristics of metals and nonmetals
11.the number of protons in the nucleus of an atom
16.an element that varies by the number of neutrons in the nucleus.

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