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Across 2. More than 80% of the elements are of what type? 7. At room temperature, most elements are in what state? 8. During nuclear fission, the subatomic particle that is released is a(n) __? 9. A horizontal row of elements on the PT. 11. Protons and neutrons are found in the ___ of the atom. 13. A change that does not affect the identity of a substance. 16. Has properties of both metals and nonmetals. 17. A covalent bond tends to form between two ___ elements. 18. A vertical column of elements. 21. Total number of protons in an atom. 23. Reactions between two atoms involve ____ electrons. 28. Carbon-12 and Carbon-14 are examples of ? 29. First subatomic particle discovered. 31. The joining of two smaller H nuclei to form a He nucleus. 32. The most difficult radiation to block is ___?

Down 1. ____ spaces were left in Mendeleev's PT for undiscovered elements. 3. Groups 3-12 on the periodic table are known as the ___ elements. 4. Two oppositely charged particles form an ___ bond. 5. Na2SO4 represents a chemical _____. 6. In beta decay, the atomic number ___ by one but the mass number remains the same. 9. States that the properties of the elements repeat by a pattern if arranged in increasing atomic number order. 10. A Lewis Structure represent valence electrons as ___ placed around a chemical symbol. 12. One substance completely dissolved in another. 14. Matter that cannot be seen even with a microscope is said to be? 15. The time required for 1/2 of a radioactive sample to decay. 19. A mixture of two or more metals. 20. A bond between two element from the same family would most likely be this type. 22. Name of the family of unreactive elements. 24. Compared to a proton the charge of an electron is equal but ___? 25. The splitting of a nucleus. 26. Two protons and two neutrons make up a(n) __? 27. Eight valence electrons. 30. Atom that has gained or lost electrons and has a charge.