Across
- 4. another word for outermost electron shell
- 6. From left to right of a period, elements _____ in metallic character.
- 8. It corresponds to the number of electron shells of an element.
- 9. Elements with a tendency to lose electrons and form cations.
Down
- 1. For atoms, the number of protons is the same as the number of _____.
- 2. Elements in the same group have the ______ number of valence electrons
- 3. Elements that have same number of valence electrons undergo similar _______ reactions
- 5. vertical columns of the elements in the Periodic Table
- 7. Elements in the Periodic Table are arranged in increasing _______ number.