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Name: __________________________ Per: _______ Date: ________________ Atomic Structure and the Periodic Table Vocabulary period isotope electron reactive group half-life nucleus metals atomic number nonmetals atomic mass proton metalloids periodic table atomic mass number neutron radioactivity ion Directions: Use the word bank above to write the vocabulary word on the line that matches each definition. Each word/s will be used one time. 1. An atomic particle that is positively charged. __________________________________________________________________ 2. An element that has the same number of protons but different number of neutrons in the nucleus. __________________________________________________________________ 3. It’s the average mass of the isotopes of atoms of an element. __________________________________________________________________ 4. An atomic particle that has no charge. __________________________________________________________________ 5. Elements that have properties of both metals and nonmetals. __________________________________________________________________ 6. The elements in a column on the periodic table. __________________________________________________________________ 7. The amount of time it takes for one-half of the atoms in a particular sample to decay. __________________________________________________________________ 8. The part of an atom that contains protons and neutrons. __________________________________________________________________ 9. Formed when an atom loses or gains one or more electrons. __________________________________________________________________ 10. The atomic particle that is negatively charged and moves around the outside of the nucleus. __________________________________________________________________ 11. A table showing a repeating pattern of properties of the elements. __________________________________________________________________ 12. The process by which atoms produce energy and produce particles. __________________________________________________________________ 13. Each horizontal row in the periodic table. __________________________________________________________________ 14. The number of protons in an atom’s nucleus, which serves to identify an atom. __________________________________________________________________ 15. The sum of an atom’s protons and neutrons. __________________________________________________________________ 16. Elements that conduct electricity and heat well, and have a shiny appearance. __________________________________________________________________ 17. Term used indicates how likely the element is to undergo a chemical change. __________________________________________________________________ 18. The elements on the right side of the periodic table that have properties opposite of those of metals. __________________________________________________________________ Choose the vocabulary word that matches each description by circling it. Use the bolded words in the sentences as clues. 19. Sometimes this is called a family of elements because these elements seem to be related. period periodic table group 20. Every atom of each element has a unique number of this particle. electrons protons neutrons