Unit 7 - Periodic Table

Edit Answers
12345678910111213141516171819202122
Across
  1. 2. A scientist who created the first periodic table and predicted the existence of undiscovered elements
  2. 3. Elements found in the middle of the periodic table that often have multiple charges and are good conductors
  3. 5. Atoms of the same element with different numbers of neutrons
  4. 10. A chart that organizes all known elements by increasing atomic number and similar properties
  5. 13. A vertical column on the periodic table; elements in the same group have similar properties
  6. 14. Very reactive nonmetals found in group 17 of the periodic table
  7. 16. The number of protons in an atom’s nucleus; it identifies which element the atom is
  8. 18. Negative particle outside of the nucleus in the electron cloud
  9. 19. – Positive particle in the nucleus
  10. 20. How easily an element reacts with other substances
  11. 21. Elements in Group 1 of the periodic table that are very reactive metals
  12. 22. – The center of an atom that contains protons and neutrons and has most of the atom’s mass
Down
  1. 1. Elements that have properties of both metals and nonmetals; they are often used in electronics
  2. 2. The total number of protons and neutrons in an atom’s nucleus
  3. 4. Elements that are made in laboratories and do not occur naturally on Earth
  4. 5. An atom that has gained or lost electrons and now has a positive or negative charge
  5. 6. A one or two letter abbreviation used to represent an element
  6. 7. – Neutral particle in the nucleus with protons
  7. 8. Simple diagrams that show the atomic structure of an atom
  8. 9. Elements that are usually shiny, conduct heat and electricity well, and can be bent or shaped
  9. 10. The idea that when elements are arranged by increasing atomic number, their properties repeat a pattern
  10. 11. Cloud – The area around the nucleus where electrons move; it shows where electrons are likely to be found
  11. 12. Elements in Group 18 that are very unreactive because their outer electron shells are full
  12. 15. – The smallest particle of an element that still has the properties of that element
  13. 17. Elements that are usually dull, do not conduct heat or electricity well, and may be gases or brittle solids