Science Vocabulary Crossword

1234567891011121314151617181920
Across
  1. 4. the total number of protons and neutrons in a nucleus
  2. 7. A period is the name given to a horizontal row of the periodic table.
  3. 11. an element whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors.
  4. 12. a product is a substance that is formed as the result of a chemical reaction
  5. 13. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
  6. 14. The law of conservation of mass states that mass is neither created nor destroyed. In a closed system, mass of reactants is equal to mass of products
  7. 15. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  8. 19. A chemical formula tells us the number of atoms of each element in a compound
  9. 20. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
Down
  1. 1. the basic unit of a chemical element.
  2. 2. a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns
  3. 3. a group is a column of elements in the periodic table of the chemical elements
  4. 5. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
  5. 6. The electron cloud is ​the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital
  6. 8. Any rearrangement of electrons in two atoms that generates a force, causing the atoms to be bound to each other, forming a molecule.
  7. 9. a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed
  8. 10. an element or substance that is not a metal.
  9. 16. a substance that takes part in and undergoes change during a reaction.
  10. 17. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
  11. 18. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.