Atomic Model
Electron Configuration
Electrons don’t simply bunch up around the nucleus of an atom. They arrange themselves into orderly shells. You can think of it like the lanes on a circular athletics track. But, only a few electrons can fit into each shell. Therefore, atoms with more electrons need more shells. How many electrons can fit in the first shell? _________
How many electrons can fit in the second shell? _________ How many electrons can fit in the third shell? 18 How many electrons can fit in the forth shell? And so on … This is a table of electron configurations of the first 20 atoms. Electron Shells Atomic Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Element Name Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 4 5 6 7 32
1 2 3 4 5 6 7 8 8 8 8 8 8 8 8 8 8 8
1 2 3 4 5 6 7 8 8 8
1 2
R Laugesen
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