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.
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2. An element that has the same number of protons but different number of neutrons in the
nucleus.
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3. It’s the average mass of the isotopes of atoms of an element.
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4. An atomic particle that has no charge.
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5. Elements that have properties of both metals and nonmetals.
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6. The elements in a column on the periodic table.
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7. The amount of time it takes for one-half of the atoms in a particular sample to decay.
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8. The part of an atom that contains protons and neutrons.
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9. Formed when an atom loses or gains one or more electrons.
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10. The atomic particle that is negatively charged and moves around the outside of the
nucleus.
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11. A table showing a repeating pattern of properties of the elements.
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12. The process by which atoms produce energy and produce particles.
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13. Each horizontal row in the periodic table.
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14. The number of protons in an atom’s nucleus, which serves to identify an atom.
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15. The sum of an atom’s protons and neutrons.
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16. Elements that conduct electricity and heat well, and have a shiny appearance.
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17. Term used indicates how likely the element is to undergo a chemical change.
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18. The elements on the right side of the periodic table that have properties opposite of
those of metals.
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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