Across
- 3. A ______ is the name given to a horizontal row of the periodic table.
- 4. A _______ is made up of atoms.
- 7. He concluded there was a major Element he was missing
- 8. Atomic ______ is determined by the number of protons, and hence increases.
- 9. _____ in chemistry, a column in the periodic table of the chemical elements.
Down
- 1. Common salt is a _______ of sodium and chlorine.
- 2. An electric current consists of a moving stream of _______.
- 3. The periodic _____ organizes chemical elements according to trends in their physical and chemical properties.
- 5. Early in 1932 James Chadwick discovered the _______.
- 6. When an ____ is charged, it becomes an ion.
- 10. The nucleus of a hydrogen atom is a ______.