Atomic Mass vs Mass Number Concept Map

Atomic Mass vs Mass Number Concept Map

1. Average Atomic Mass

   • This is a weighted average mass of the atoms of all the different isotopes of that element
   • For example, on average, chlorine's atom is 35.45 amu. This takes into account the abundance of the different isotopes

2. Atomic Mass Units (amu)

   • The mass of one proton is approximately the mass of one neutron, which is approximately the mass of 2000 electrons
   • 1 amu = 1.6605 x 10^-24 grams

3. Relative Energies

   • S-orbital contains 2 electrons (1 sub-orbital)
   • P-orbital contains 6 electrons (3 sub orbitals)
   • D-orbital contains 10 electrons (5 sub orbitals)
   • F-orbital contains 14 electrons (7 sub orbitals)

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