Elements

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  1. 2. hard, but can break or shatter easily
  2. 5. earth metals the elements occupying group IIA of the periodic table, they are reactive, electropositive, divalent metals, and form basic oxides which react with water to form comparatively insoluble hydroxides
  3. 8. a material which contains moveable electric charges
  4. 10. metals any set of metallic elements occupying a central block on the periodic table. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored
  5. 11. mass the mass of an atom if a chemical element expressed in atomic mass units
  6. 14. a stable subatomic particle occurring in all atomic nuclei with a positive charge equal and opposite to an electrons charge`
  7. 15. symbol the abbreviations for a chemical element
  8. 16. any of the series of metallic elements from actinium to lawrencium on the periodic table, they are radioactive, the heavier members being extremely unstable and not of natural occurrence post
  9. 17. an element whose properties are intermediate between those of metals and solid nonmetals or semiconductors
  10. 18. Mendeleev Creator of the periodic table
  11. 19. a stable subatomic particle with a negative charge, found in all atoms and acts as the primary carrier of electricity in solids
  12. 20. gaseous elements on the periodic table
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  1. 1. metals the elements occupying group 1A of the periodic table, they are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides
  2. 3. any of the series of fifteen metallic elements that form lanthanum to lutetium in the periodic table
  3. 4. a substance whose atoms all have the same number of protons
  4. 6. an element or substance that is not a metal
  5. 7. number the number of protons in a nucleus of an atom, which determines the chemical properties if an element and its place on the periodic table
  6. 9. a subatomic particle with about the same mass as a proton but without electric charge
  7. 12. metals considered the poor metals and metalloids
  8. 13. a solid material that is typically hard, shiny, fusible, and ductile, with good electrical and thermal energy
  9. 17. able to be hammered or pressed permanently out of shape without breaking or cracking