Electron configuration

• Where are electrons located in an atom?

  Electrons are in shells around the nucleus
• What are the principal quantum numbers for electron shells?

  n equals one, two, three, etc.
• What are the names of the subshells in electron configuration?

  S, P, D, and F
• How many orbitals does the S subshell have?

  One orbital
• How many orbitals does the P subshell have?

  Three orbitals
• How many orbitals does the D subshell have?

  Five orbitals
• How many electrons can each orbital hold?

  Two electrons
• What is the maximum number of electrons in the first shell?

  Two electrons
• What is the maximum number of electrons in the second shell?

  Eight electrons
• What is the maximum number of electrons in the third shell?

  Eighteen electrons
• What is the electron configuration of fluorine with nine electrons?

  1s2 2s2 2p5
• What is the electron configuration of calcium with 20 electrons?

  1s2 2s2 2p6 3s2 3p6 4s2