Across
- 2. Any material that is made up of only one type of atom
- 4. A count of the number of protons in the atomic nucleus
- 6. Any of the possible energies an electron may have in an atom
- 9. An electron in the outermost energy level of an atom
- 10. Any member of a set of atoms of the same element whose nuclei contain the same number of protons but different numbers of neutrons
Down
- 1. Who designed the periodic table?
- 3. An atom that carries an electrical charge
- 5. A _____ is used for things that are too small or too large to be observed or that are too difficult to be understood easily
- 7. table A chart in which all known elements are listed in order of atomic number
- 8. A vertical column in the periodic table; also known as the family of elements