Unit 6 Ch. 3 Science

2. an arrangement of the elements showing the repeating pattern of their properties.
6. the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element.
7. the ability of an object to transfer heat.
8. an element in Group 2 of the periodic table.
10. the gradual wearing away of a metal element due to a chemical reaction.
11. the number of protons in the nucleus of an atom.
13. a molecule consisting of two atoms.
15. the ease and speed with which an element combines, or reacts, with other elements and compounds.
17. one of the elements in Group 3 through 12 of the periodic table.
21. a tiny, negatively charged particle that moves around the outside of the nucleus of an atom.
23. the way a mineral reflects light from its surface.
26. an element that lacks most of the properties of a metal.
27. a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.
28. an element in Group 18 of the periodic table.

1. the ability of an object to carry electric current.
2. small, positively charged particles that are found in the nucleus of an atom.
3. a term used to describe a material that can be pulled out into a long wire.
4. the average mass of all the isotopes of an element.
5. a term used to describe material that can be hammered or rolled into flat sheets.
9. a substance that can conduct electric current under some conditions.
12. a horizontal row of elements in the periodic table.
14. an atom with the same number of protons and a different number of neutrons from other atoms of the same element.
16. the sum of protons and neutrons in the nucleus of an atom.
18. an element in Group 1 of the periodic table.
19. the central core of an atom which contains protons and neutrons.
20. a region of an atom in which electrons of the same energy are likely to be found.
22. a small particle in the nucleus of the atom, with no electrical charge.
24. an element found in Group 17 of the periodic table.
25. an element that has some characteristics of both metals and nonmetals.
29. elements in the same vertical column of the periodic table; also called family.