Physiology 2130 Chapter Notes - Chapter 1.2: Boron Group, Electronegativity
14 Mar 2014
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The first periodic table: drafted in 1869 by dimitri mendeleev: father of the periodic table , he observed physical properties such as reactivity and density, he predicted the existence of ga and its density within 1% accuracy, periodic is a reference to periodic law proposed by mendeleev and meyer in 1869, when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically, derives from the schrodinger equation (cid:224) atomic orbitals: aufbau and pauli exclusion principles (cid:224) periodic table. The main group elements: main group elements (cid:224) s block and p block elements, s block (cid:224) have 1 valence electron (group 1: alkali metals)or 2 valence electrons (group 2: alkaline earth metals, all elements in the same group have an identical valence electron configuration; each successive heavier element has a higher principal quantum # which is represented by the rows (periods, p block (cid:224) those from group 13 18.
