Periodic Table

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Across
  1. 2. an element or substance that is not a metal
  2. 5. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g., iron, gold, silver, copper, and aluminum, and alloys such as brass and steel).
  3. 7. makes up matter
  4. 10. 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
  5. 12. six chemical elements in group 2 of the periodic table. They are beryllium, magnesium, calcium, strontium, barium, and radium. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure
  6. 15. a set of elements occupying a column in the periodic table and having broadly similar properties arising from their similar electronic structure
  7. 16. 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
  8. 19. makes up a class of chemical elements with similar properties; under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity
  9. 20. a group in the periodic table consisting of five chemically related elements: fluorine, chlorine, bromine, iodine (I), and astatine
Down
  1. 1. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
  2. 3. an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell
  3. 4. 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
  4. 6. the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes
  5. 8. an arrangement of data in rows and columns, or possibly in a more complex structure
  6. 9. a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals
  7. 11. a set of elements occupying an entire horizontal row in the periodic table
  8. 13. the central and most important part of an object, movement, or group, forming the basis for its activity and growth
  9. 14. 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
  10. 17. An element symbol is a one- or two-letter abbreviation for a chemical element name. When a symbol consists of two letters, the first letter is always capitalized, while the second letter is lowercase. Element symbols also can refer to alchemy symbols for the elements or to the symbols used to describe isotopes
  11. 18. chemical element with the symbol H and atomic number 1