Across
- 3. : the way something is symbolized.
- 4. : a horizontal row in the periodic table, with elements having increasing atomic numbers.
- 6. : one or two letters that signify the elements on the periodic table.
Down
- 1. : organizes elements by atomic number and similar properties.
- 2. : the average mass of an element's atoms, measured in atomic mass units (amu), based on the number of protons and neutrons in the atom's nucleus.
- 5. : a vertical column in the periodic table, where elements share similar chemical properties.