1					2
		3		4
												5
6														7
8
9
					10

Across 1. the number of protons in the nucleus of an atom 6. a chart of the elements showing the repeating pattern of their properties 9. number of protons and neutrons added together 10. an element in Group 18 of the periodic table, non-reactive

Down 2. the letter or letters that represent an element on the periodic table 3. the horizontal rows in the periodic table; they contain elements of similar 4. elements in the same vertical column of the periodic table 5. an element that has some characteristics of both metals and nonmetals 7. an element that lacks most of the properties of a metal 8. a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity