CHEM104 Lecture Notes - Lecture 4: Ionic Radius, Noble Gas, Ionic Bonding
11 Apr 2016
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Ferromagneism: alignment of nuclear spins-not related, strongly atracted by a magnet. Gouy balance-a device invented by louis georges gouy for measuring the magneic suscepibility of a sample: pushed up if diamagneic due to repulsion; pulled down of paramagneic due to atracion. John newlands: proposed law of octaves (eights) Every eighth element arranged by atomic mass and had similar properies. Fell apart at transiion metals; worked up to calcium (s and p blocks) 1869-mendeleev"s periodic table; was teaching at the ime. Arranged all known elements by atomic mass but not in octaves. Predicted existence of some elements which were not known. Bad-lots of elements missing and had some atomic masses out of order (needed atomic numbers not masses) Found frequency of scatered x-rays determined atomic # Elements arranged by atomic number grouped elements into families (columns) of elements with like properies. Columns share similar properies such as charge. Tendency to be isoelectronic with noble gases.
