Across
- 1. the degree to which an element tends to gain electrons and form negative ions in chemical reactions
- 4. rows of the elements
- 7. columns of the elements
- 9. representations expressed by symbols
- 11. a well known chemical elements best used as semiconductor
- 12. the series of the 15 metal and radioactive elements starting from actinium to lawrencium
- 14. orbital set surrounding the atom's core
- 15. a mark or character used as a conventional representation of something
Down
- 2. an arrangement of parts or elements in a particular form
- 3. the quantity of matter which a body contains
- 5. non-reactive gas chemical often used in fluorescence lights
- 6. most reactive groups of metals
- 8. attribute, quality, or characteristic
- 10. elements that sit between metals and nonmetals
- 13. the positively charged central core