Across
- 3. element that is not a metal and has properties generally opposite to those of a metal
- 7. positively charged particle in atom’s nucleus
- 8. vertical column in the periodic table
- 10. element easily shaped & good conductor of electricity & heat
- 11. atom of one element that has a different number of neutrons than another atom of the same element
- 13. number of protons in the nucleus of an atom.
- 14. total number of protons and neutrons in atom’s nucleus
- 15. negatively charged particle outside an atom’s nucleus.
Down
- 1. table of elements
- 2. length of time it takes for half of the atoms in a sample of a radioactive element to decay into atoms of another element
- 4. element with metal and nonmetal properties
- 5. atom that has a positive or negative electric charge
- 6. central region of an atom where most of the atom’s mass is found in protons and neutrons
- 9. particle that has no electric charge in an atom’s nucleus
- 12. horizontal row in the periodic table o