We've got 18 to choose from. From the launch of the site we've been asked, "Why start with 18?" The rules for the first 18 elements are very straight-forward.
(1) Electrons fit nicely into three shells.
(2) These elements make up most of the matter in the universe.
(3) It's a lot easier to remember facts about 18 elements than over 100 elements.
Element 1: Hydrogen Element 2: Helium Element 3: Lithium Element 4: Beryllium Element 5: Boron Element 6: Carbon Element 7: Nitrogen Element 8: Oxygen Element 9: Fluorine Element 10: Neon Element 11: Sodium Element 12: Magnesium Element 13: Aluminum Element 14: Silicon Element 15: Phosphorus Element 16: Sulfur Element 17: Chlorine Element 18: Argon
Who are we kidding? We teased you with only 18 elements for many years. We've added the next 18 elements from the fourth period. You need to remember that this is the first row with transition elements. Those transition metals have electron configurations that are a little different from the first 18. Make sure you understand the first 18 before you move on to this set.
Element 19: Potassium Element 20: Calcium Element 21: Scandium Element 22: Titanium Element 23: Vanadium Element 24: Chromium Element 25: Manganese Element 26: Iron Element 27: Cobalt Element 28: Nickel Element 29: Copper Element 30: Zinc Element 31: Galium Element 32: Germanium Element 33: Arsenic Element 34: Selenium Element 35: Bromine Element 36: Krypton
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