Elements and Compounds

3. The force that holds some compounds together due to attraction between opposite charges.
4. A substance formed when two or more elements chemically join together.
6. Describes a pattern that repeats.
7. The number of protons in an atom.
10. Elements that look dull and break instead of bend.
11. Anything that has mass and takes up space.
13. A negatively charged particle that moves around the nucleus of an atom.
14. A combination of symbols and numbers that shows the types and numbers of atoms in a compound.
16. Elements that have properties of both metals and nonmetals.
17. The total number of protons and neutrons in an atom.
20. A pure substance that cannot be broken down into simpler substances.
21. Elements that conduct heat and electricity, are shiny when polished, and can be shaped.

1. The theory that all matter is made of tiny particles called atoms.
2. A particle with no charge found in the nucleus of an atom.
5. Horizontal rows on the periodic table.
8. The center of an atom that contains most of the atom’s mass.
9. A chart that organizes elements by increasing atomic number.
11. The smallest particle of a compound.
12. A positively charged particle found in the nucleus of an atom.
15. Vertical columns on the periodic table that contain elements with similar properties.
18. A one- or two-letter abbreviation used to represent an element.
19. The smallest particle of an element that still has the element’s chemical properties.