Electron Configuration

• An Orbital is the region around the nucleus which can hold up to 2 electrons with opposite spins,

  Must have opposite spins
• A Sublevel is all of the orbitals of the in one level e.g 2s2 2p6 = 8e
• 4s Subshell fills before the 3d subshell this is because its has less energy compared to the 3d subshell

  Once the 4 subshell contains electrons it now has a higher energy than 3d subshell and electrons are lost from 4s subshell before 3d subshell
• Chromium has a unusual configuration only has 1 electron in its 4s subshell, Chromium atom has a half full 3d subshell(5e)

  This is because 3d subshell us more stable when it is either half full or completely full
• Copper also has a unusual electronic configuration with only 1 electron in its 4s subshell, Copper atom has 10 electrons in its 3d subshell

  This is because 3d subshell is more stable when half full(5 electrons) or completely full(10 electrons)
• S orbital is present in every energy level has a spherical shape

  P orbital has a dumbbell shape and there are 6 electrons in 3p orbitals

  10 electrons there are 5 D orbital

  14 electrons there are 7F orbitals