C7 - Periodicity (Gen. Chem 1)

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5 Terms

1

atomic radius

½ distance between two colliding atoms of the same type

  • increases down and to the left of the table

2

ionization energy

energy required to remove a valence electron from its atom

  • increases up and to the right of the table

3

electron affinity

ability for an atom to gain an electron (the energy ∆)

  • noble gases: 0

  • halogens: very negative

  • column 5A: usually 0 or +

  • little change going up & down

4

alkali metals

  • silvery

  • lustrous

  • very reactive

  • colorless ions

  • high conductivity

5

alkaline earth metals

  • relatively reactive

  • solids

  • denser than alkali metals