Watch more Science Basics videos: http://www.howcast.com/guides/70-Science-Basics Subscribe to Howcast's YouTube Channel - http://howc.st/uLaHRS Understand the basic structure of atoms using the information given here. Howcast uploads the highest quality how-to videos daily! Be sure to check out our playlists for guides that interest you: http://howc.st/ytmainplaylists Subscribe to Howcast's other YouTube Channels: Howcast Health Channel - http://howc.st/HOE3aY Howcast Video Games Channel - http://howc.st/tYKKrk Howcast Tech Channel - http://howc.st/rx9FwR Howcast Food Channel - http://howc.st/umBoJX Howcast Arts & Recreation Channel - http://howc.st/vmB86i Howcast Sports & Fitness Channel - http://howc.st/vKjUjm Howcast Personal Care & Style Channel - http://howc.st/vbbNt3 Howcast empowers people with engaging, useful how-to information wherever, whenever they need to know how. Emphasizing high-quality instructional videos, Howcast brings you experts who provide accurate information in easy-to-follow tutorials on everything from makeup, hairstyling, nail art design, and soccer to parkour, skateboarding, dancing, kissing, and much, much more. Step 1: Consider atomic number Consider the atom's atomic number. This is the number of protons in the atom's nucleus. Tip The nucleus of an atom contains protons and neutrons. It is surrounded by electrons. Step 2: Consider atomic mass number Consider the atom's atomic mass number. This is the number of protons and neutrons in the nucleus. Step 3: Consider electronic configuration Consider the atom's electronic configuration. The electrons in an atom have fixed orbits with discrete energy levels. Atoms whose outer energy levels are full are less reactive than those with unfilled energy levels. Did You Know? The theory of atomic structure was developed in the early 20th century.
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