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Across 4. An atom which has gained an electron is called a ________ 5. Central region of an atom, consisting of protons and neutrons 7. Any substance that has mass and occupies space 10. Energy from the sun 11. Type of covalent bond when electrons are unequally shared between atoms 12. Type of covalent bond when electrons are equally shared between atoms 16. Particles with a positive charge 17. Anions have a ________ charge 19. The type of matter consisting of two or more of the same atom held together 21. Particles with a negative charge 24. Weakest type of chemical bond 25. Strongest type of chemical bond 26. Chemicals on the right side of a chemical equation 27. Energy from the flow of electrons or ions 29. Energy from molecular movement 30. Chemicals on the left side of a chemical equation 31. A type of matter consisting of two different types of atoms held together 32. The smallest unit of matter divisible by chemical means 33. Energy in motion

Down 1. Energy produced by sound waves 2. The primary element in the human body 3. The atomic _______ is based on the number of protons and neutrons 5. Energy from nuclear fission or fusion 6. The atomic number of an atom is based on the number of __________ 8. An atom which has lost an electron is called a ________ 9. The type of matter containing only one type of atom 12. Particles with a neutral charge 13. The ability to do work 14. Stored energy 15. The sum of potential and kinetic energy 18. Bond that occurs between polar molecules 20. Cations have a _________ charge 21. The chemical properties of an atom is based on its number of _________ 22. Compounds which do not contain carbon 23. Bond when two atoms share electrons 28. Bond when one atom takes an electron from another atom