Chemistry Chapter 5. The Periodic Table. Sept 1860, group of chemists met in Germany to review scientific matters & coming to consensus about: measurement of atomic masses determining composition of compounds using atomic masses
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The Periodic Table
Sept 1860, group of chemists met in Germany to review scientific matters & coming to consensus about:
in 1869, Dmitri Mendeleev used Cannizzaro’s method for measuring relative masses of atoms in textbook he wrote
in 1871, Mendeleev predicted properties of elements that weren’t even discovered at that time!
in 1913, Henry Moseley discovered patterns w/ x-ray tubes that led to atomic number (ch 3 notes)
group trends: as go down group, atomic radii increases due to addition of e- to larger orbitals in higher energy levels
exceptions are seen betw groups 14 & 15 b/c ½ filled sublevels are a little more stable than ones not ½ full
chemical compounds form b/c e- are lost, gained, or shared to bring an atom to a stable octet