Across
- 1. It means a pattern that we can observe across the periodic table.
- 4. It is a row in the periodic table.
- 6. Atomic ______ is the size of an atom or the distance from the nucleus to the outermost electron.
Down
- 2. These are tiny particles that move around the nucleus.
- 3. It is the building block of matter.
- 5. It is a column in the periodic table.