Across
- 3. A weighted average of the mass of the isotopes of the element (3 words)
- 7. Has a charge
- 8. Integer counting the total number of heavy particles (protons and neutrons) in the nucleus (2 words)
- 9. Very stable, nonreactive elements (2 words)
- 10. _______________ _____________ elements comprise of groups 1A to 8A in the periodic table
Down
- 1. Each element is made of tiny building blocks, __________. John Dalton thought they were indivisible
- 2. The __________ stays the same before and after a chemical reaction, indicating that atoms are not created, nor destroyed
- 4. Each element has a unique ________ ____________, an integer that counts the number of protons in the atom
- 5. ___________ of the same element have the same number of protons but different number of neutrons
- 6. Below and left of the zigzag line, the periodic table is made of elements known as __________
- 11. A vertical alignment in the periodic table, made of elements that tend to have similar properties