10-21-11 - Chemistry 1A F11 10.21.11 Dr. Shaka The Periodic...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
142 Chemistry 1A F11 10.21.11 Dr. Shaka Course Code 40000 The Periodic Table • If there had been no pattern to the elements that were isolated by chemists, or if there had been a huge number of elements, we might never have figured out chemistry at all. • However, patterns were observed: “every 8 th element seemed to have similar properties” (Newlands, 1864). • Mendeleev made this more systematic: he found a “hole” under aluminum.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
143 Chemistry 1A F11 10.21.11 Dr. Shaka Course Code 40000 The Periodic Table • The atomic masses of the elements had already been measured (how?) although atomic structure was not known. • Mendeleev predicted the properties of “first aluminum” with uncanny accuracy. • I do not know how he did his predictions, but he got the main properties of gallium right (molar mass, density, melting point, and formula for its oxide). • Later it was realized that atomic mass was not the key ingredient ( e.g. Ar vs. K)
Background image of page 2
Chemistry 1A F11 10.21.11 Dr. Shaka
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/12/2011 for the course CHEM 1A taught by Professor Tobias during the Fall '01 term at UC Irvine.

Page1 / 15

10-21-11 - Chemistry 1A F11 10.21.11 Dr. Shaka The Periodic...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online