Periodic table

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  1. 2. metal A group of elements in the middle of the periodic table that have partially filled d orbitals.
  2. 8. gas A group of elements that are generally unreactive due to their stable electron configurations.
  3. 9. A substance that cannot be broken down into simpler substances by chemical means.
  4. 10. metal A group of highly reactive metals found in Group 1 of the periodic table.
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  2. 3. A category of elements that are generally poor conductors of heat and electricity.
  3. 4. A vertical column in the periodic table that shares similar chemical properties.
  4. 5. A category of elements that are typically shiny, malleable, and good conductors of heat and electricity.
  5. 6. A horizontal row in the periodic table that represents the energy levels or electron shells of the elements.
  6. 7. number The number of protons in the nucleus of an atom, which determines the element's identity.