Across
- 1. The law of conservation of __ says that matter is never created or destroyed
- 4. The number of electrons in an atom is the same as the number of ___ in the atom
- 6. The type of radiation particles that cannot penetrate plastic or wood
- 10. On the pH scale the number 7 is ___
- 12. The name of the tenth element
- 13. The ___ number is different for each element and is the number of protons in an atom
- 16. H is the symbol for which element
- 17. The type of reaction where energy is taken in from the environment eg. ice pack
- 19. The ___ table includes all the elements ordered by their atomic number
- 20. Atoms of the same element with different mass numbers
- 21. The neutral particles in an atom
- 23. This element has an atomic number of 5
- 24. On the pH scale the numbers from 8-14 are ___
Down
- 2. On the pH scale the numbers from 0-6 are ___
- 3. The name of a reaction where a substance reacts with oxygen and heat is released
- 5. Together the protons and neutrons form the ___ in the centre of the atom
- 7. The 'building blocks' of matter, what all matter is made up of
- 8. The type of reaction where energy is released eg. a heat pack
- 9. The new substances that are formed after a chemical reaction
- 11. The type of radiation particles that can only be stopped by thick lead or concrete
- 14. Cl is the symbol for which element
- 15. The negative particles in an atom that orbit on shells
- 18. The type of radiation particles that can easily be stopped by a piece of paper
- 22. The number of protons in a Lithium atom
- 25. Carbon's atomic number