Across |
1. | The center of an atom; made up of protons and neutrons |
4. | A neutral subatomic particle in the nucleus of an atom. |
7. | The total number of protons and neutrons in the nucleus of an atom. |
11. | A chart that organizes information about all known elements according to their properties. |
12. | An atom that has gained or lost one or more elctrons. |
13. | A vertical column of elements in the periodic table. |
15. | An electron that may be found in the outermost energy level of an atom. |
16. | The number of protons in the nucleus of an atom. |
17. | A positively charged subatomic particle in the nucleus of an atom. |
19. | The elements that make up the zig-zag line and have properties of both metals and nonmetals. |
20. | The smallest unit of a compund that has all the properties of a compound. |