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Unformatted text preview: , termed shells. – Orbitals can hold a maximum of 2 e‐
– The quantity of energy levels, or shells, is determined by the quantity of electrons: 1st shell: 1 orbital only (2 e‐’s max) 1s 2nd shell: 4 orbitals (8 e‐’s max) 2s, 2px, 2py, 2pz 3rd shell: 4 orbitals (8 e‐’s max) Neon; atomic number 10
Is neon a reactive molecule? 2e‐ 1st shell 8e‐ 2nd shell **note that an atom has a 3‐D shape 10e‐ total An Atom’s Electron Arrangement Determines Its’ Chemical Activity
• Atoms with unpaired electrons in its’ outermost energy shell are reactive termed valence electrons
– Neon is unreactive (outer shell completely filled with 8e‐)
– Carbon: atomic # of 6:
Nitrogen: atomic # of 7: •
• 6p6n •
valence = 4
• arrows indicate unpaired outer
Oxygen = 2
Hydrogen = 1 • paired electrons...
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This note was uploaded on 08/16/2011 for the course BIOL 1361-1362 taught by Professor Any during the Spring '08 term at University of Houston.
- Spring '08