Chemistry Articles

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: HydrogenElement 2: HeliumElement 3: LithiumElement 4: BerylliumElement 5: BoronElement 6: CarbonElement 7: NitrogenElement 8: OxygenElement 9: Fluorine
Element 10: NeonElement 11: SodiumElement 12: MagnesiumElement 13: AluminumElement 14: SiliconElement 15: PhosphorusElement 16: SulfurElement 17: ChlorineElement 18: ArgonWho 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: PotassiumElement 20: CalciumElement 21: ScandiumElement 22: TitaniumElement 23: VanadiumElement 24: ChromiumElement 25: ManganeseElement 26: IronElement 27: Cobalt
Element 28: NickelElement 29: CopperElement 30: ZincElement 31: GaliumElement 32: GermaniumElement 33: ArsenicElement 34: SeleniumElement 35: BromineElement 36: Krypton