Across
- 4. Carbon-12 and Carbon-14 are examples of ____.
- 8. The __ __ represents the weighted average of all the isotopes of an element.
- 9. The number of protons and neutrons in an atom gives its ____.
- 14. The mass number of an atom is the sum of its neutrons and ____.
- 15. The table that organizes elements by atomic number is the ____.
- 17. The atomic number of an element is equal to the number of ____.
- 18. The horizontal rows of the periodic table are called ____.
- 20. An Oxygen ion has a charge of -2, this type of ion is a ______.
- 21. ______ is an element part of the Halogen group.
Down
- 1. Group I is the periodic Table is call ____
- 2. Atoms of the same element with different numbers of neutrons are called ____.
- 3. The element with 46 protons is ______.
- 5. The element located in Group 6, Period 4 is ____.
- 6. Isotopes of the same element have different numbers of ____.
- 7. A column in the periodic table is also called a ____.
- 10. Neutrons have no _____.
- 11. The element with atomic number 17 is _______.
- 12. An example of a noble gas is ______.
- 13. Sodium has a charge of +1, this type of ion is call a _____.
- 16. The subatomic particle with a negative charge is the ____.
- 19. The first element in group 14 is _______.