Across
- 4. The number of protons and neutrons in an atom's nucleus
- 7. The total numbers of protons and neutrons in an atom's nucleus
- 10. The length of time it takes for half of the atoms in a sample of radioactive element to decay into atoms of another element
- 12. An atom or group of atoms that has a positive or negative electric charge
- 13. A positively charged particle located in an atom's nucleus
- 14. A horizontal row in the periodic table of the elements
- 15. A table of elements, arranged by atomic number, that shows the pattern in their properties
Down
- 1. An element that is not a metal and has properties of generally opposite of those of a metal
- 2. A particle that has no electric charge and is located in an atom's nucleus
- 3. A vertical column in the periodic table of the elements
- 5. An element that tends to be shiny, easily shaped, and a good conductor of electricity and heat
- 6. The center region of an atom where most of the atom's mass is found in protons and neutrons
- 8. An element that has both properties of metal and nonmetal
- 9. A negatively charged particle located outside an atom's nucleus
- 11. An atom of one element that has a different number of neutrons than another atom of the same element