Atoms & Elements

3. center, or core, of an atom
4. element that has the property of shiny luster, ductility, and malleability
5. element that lacks most of the properties of a metal
9. the way a material reflects light
11. repeating pattern
14. substances that cannot be chemically broken down into simpler substances
15. smallest part an element that can be identified as that element
17. number number of protons in the nucleus of an atom
18. able to draw into thin wires
20. table a chart that organizes the elements by their properties
21. particle that has a positive charge

1. vertical column of elements, also called families
2. elements that make up group 17 in the periodic table
4. able to be hammered into different shapes
6. particle that has no charge
7. gases elements that make up group 18 in the periodic table
8. particle that has a negative charge
10. horizontal row of elements in the periodic table
12. symbol shortened way of writing the name of an element
13. elements that have characteristics of both metals and nonmetals
16. elements made in a laboratory
19. atom of an element with the same number of protons as the other atoms but a different number of neutrons