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Periodic Table. Electron Configurations. Aufbau Principle – electrons occupy the orbitals of lowest energy first Hund’s Rule - electrons fill orbitals in the same energy level first with electrons spinning the same direction and then the other direction

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periodic table

Periodic Table

Electron Configurations

slide2

Aufbau Principle – electrons occupy the orbitals of lowest energy first

  • Hund’s Rule - electrons fill orbitals in the same energy level first with electrons spinning the same direction and then the other direction
  • Valence electrons are the ones in the highest occupied energy level.
  • N, P, As, Bi have the same outer energy level configurations.
slide4

The maximum number of electrons that can occupy one orbital is ____

  • 2
  • Give the symbol and name of the elements that correspond to these configurations of an atom.
  • 1s 22s 22p 3 ____ ___________
  • N Nitrogen
  • 1s 22s 22p 4 ____ ___________
  • O Oxygen
  • 1s22s22p63s23p1 ____ ___________
  • Al Aluminum
slide5

1s 22s 22p 63s 23p 2 ____ ___________

  • Si Silicon
  • 1s 22s 22p 63s 1 ____ ___________
  • Na Sodium
  • 1s 22s 22p 63s 23p 64s 1 ____ ___________
  • K Potassium
  • 1s 22s 22p 63s 23p 63d 24s 2 ____ ___________
  • Ti Titanium
slide6

How many valence electrons do the following elements have?

  • oxygen ___________
  • 6
  • aluminum ___________
  • 3
  • sodium ___________
  • 1
  • barium ___________
  • 2
slide7

The next atomic orbital in the series 1s, 2s, 2p, 3s, 3p is ____

  • 4s
  • The electron configuration for fluorine is ________
  • 1s22s22p5
  • The correct electron configuration for
  • silicon, atomic number 14 is __________
  • 1s 22s 22p 63s 23p 2
  • The configuration for the outermost (valence) energy level
  • in Ca is _____
  • 4s2
slide8

Which orbital configuration is the valence electron configuration for each of these elements?

  • sulfur _____
  • s2p4
  • germanium _____
  • s2p2
  • beryllium _____
  • s2
  • krypton _____
  • s2p6
  • strontium _____
  • s2
slide9

Give electron configurations for atoms of these elements

  • Na _________________
  • 1s22s22p63s1
  • S _________________
  • 1s22s22p63s23p4
  • Mg _________________
  • 1s22s22p63s2
  • Ne _________________
  • 1s22s22p6
slide10

K _________________

  • 1s22s22p63s23p64s1
  • selenium _________________
  • 1s22s22p63s23p63d104s24p4
  • vanadium _________________
  • 1s22s22p63s23p63d34s1
  • nickel _________________
  • 1s22s22p63s23p63d84s2
  • calcium _________________
  • 1s22s22p63s23p64s2