periodic table
Across
- 2. An expression that shows the elements in a compound and the proportions of those elements.
- 5. The averaged number of protons and neutrons in an element.
- 9. The vertical columns on the periodic table
- 11. The man-made or laboratory made elements on the periodic table.
- 12. Forms of the same element that contain equal numbers of protons but different numbers of neutrons in the nucleus.
- 15. Organizes all discovered elements into rows (periods) and columns (groups) according to increasing atomic number.
- 17. The horizontal rows on the periodic table.
- 18. The number of protons in an element.
- 19. An atom or molecule with a net charge due to the loss or gain of one or more electrons.
Down
- 1. The material involved in the change is structurally the same before and after the change.
- 3. An element whose properties are between those of metals and solid nonmetals or semiconductors.
- 4. A process that involves rearrangement of the molecular or ionic structure of a substance.
- 6. The positively charged subatomic particles in the nucleus of an atom.
- 7. A change of materials into another, new materials with different properties and one or more than one new substances are formed.
- 8. Electron in the outer shell of an atom.
- 10. Metals have a shiny appearance, are good conductors of heat and electricity, can be melted, are malleable and ductile.
- 13. Made of one type of atom, cannot be separated
- 14. The neutrally (no charge) subatomic particle in the nucleus of an atom.
- 16. a type of chemical element that lacks the charistics of a metal