Electron Shells

Cards (15)

  • What do electrons occupy in an atom?
    Electrons occupy shells (or energy levels).
  • How do electron shells differ from snail shells?
    Electrons do not nibble on plants like snails do.
  • What are the rules for filling electron shells?
    1. The lowest energy levels are filled first.
    2. Maximum electrons per shell:
    • 1st shell: 2 electrons
    • 2nd shell: 8 electrons
    • 3rd shell: 8 electrons
  • How many electrons can the first shell hold?
    The first shell can hold 2 electrons.
  • How many electrons can the second shell hold?
    The second shell can hold 8 electrons.
  • What is the electronic structure of nitrogen?
    The electronic structure of nitrogen is 2.5.
  • How many protons does nitrogen have?
    Nitrogen has seven protons.
  • What does the periodic table indicate about an element's electrons?
    The periodic table indicates the number of protons, which equals the number of electrons in a neutral atom.
  • How do you determine the electronic structure of an element?
    You follow the electron shell rules based on the number of protons.
  • How does the electronic structure of argon look based on its protons?
    The electronic structure of argon is 2.8.8.
  • How can you determine the number of shells and outer shell electrons of an element from the periodic table?
    • The number of shells is equal to the period of the element.
    • The group number indicates how many electrons are in the outer shell.
  • What is the electronic structure of sodium based on its period and group?
    The electronic structure of sodium is 2.8.1.
  • How many protons does sodium have?
    Sodium has 11 protons.
  • What is the maximum number of electrons in the third shell?
    The maximum number of electrons in the third shell is 8.
  • Why is it easy to work out the electronic structure of elements?
    Because the rules for filling electron shells are straightforward.