Across
- 2. the smallest particle of a substance that still has the properties of that substance.
- 5. is an element that has an atomic mass of 107.87 amu.
- 7. the number of protons in the nucleus of one atom of an element.
- 10. is a positively charged particle located in the nucleus of an atom.
- 11. is an element that has an 12-electrons.
- 13. the mass of one atom of an element (amu).
- 16. is an element that has 6-protons.
- 17. a row of elements in the periodic table arranged by atomic numbers.
Down
- 1. particle with neutral charge located in the nucleus.
- 3. is a negatively charged particle found outside the nucleus of an atom.
- 4. atoms of the same element with different numbers of neutrons in the nucleus and thus different atomic masses.
- 6. organized the periodic table in 1868.
- 8. a combination of two or more substances that have not combined chemically and that can be separated by physical means.
- 9. matter made up of two or more elements.
- 12. the center of an atom made up of protons and neutrons.
- 14. smallest particle in which an element can be divided an still have the properties of that element.
- 15. is also known as groups of elements.