chemistry crossword

2. a substance formed when two or more chemical elements are chemically bonded together
3. A compound which is held together by ionic bonds (metal and non-metal)
5. negatively charged ion
6. Group 2 from the left side of the metals, very reactive and not found free in nature
9. Occurs when 2 elements in different compounds trade places
10. the interactions of substances as studied in chemistry.
12. Group 1 from the right side in the non-metals, outer orbit is full, almost totally unreactive, doesn't form compounds
13. the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
15. bonds a bond between a positive and negative charged ions
16. a simple substance that cannot be broken down into smaller parts or changed into another substance
17. Group 1 in the left side of the metals, extremely reactive and are only found in the nature as compounds, not hydrogen

1. A number written at the lower right corner behind the element
2. positively charged ion
4. A positively and negatively charged atom
7. Is the basic unit of an element. It is a form of matter which may not be further broken down using any chemical means
8. The sharing of electrons (covalently bonds)
11. The sharing of molecules
14. Group 17 on the right side of non-metals, most reactive non-metals and only appears as compounds in nature, often found on living things