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Across 1. The number of protons plus neutrons 4. The element with an atomic number of 7 is... 6. Any particle inside the atom is known as a ______ particle 7. Flurorine has 9 protons and ______ neutrons 8. The number of protons is always the same as the number of..... 9. A subatomic particle with no charge 10. The element with a proton number of 3 is.... 12. A subatomic particle with positive charge 13. An electron has a mass close to.... 14. The element with an atomic mass of 12 is....

Down 2. The mass of a proton or a neutron is... 3. tells you the number of protons in an atom 5. The centre of the atom 8. A subatomic particle with negative charge 11. The basic building block of matter