Across
- 2. the number that tells us the mass of an atom.
- 3. the relative mass of protons and neutrons
- 6. where all the elements are arranged in order.
- 11. the part of the atom with no charge
- 13. a type of atom that only has one proton and one electron
- 14. the part of the atom with a negative charge
- 15. where the protons and neutrons are found
- 17. a horizontal row in the periodic table going from left to right.
Down
- 1. a scientific word used to describe a substance.
- 4. creator of the periodic table.
- 5. the positively charged part of the atom
- 7. the simplest type of substance, mad of one type of atom.
- 8. the number that tells us the amount of protons in an atom.
- 9. where the electrons are found
- 10. made of two types of atom but not chemically joined
- 12. a vertical column in the periodic table going from top to bottom
- 16. made of two types of atoms chemically joined together