CH110 Chapter Notes - Chapter 8: Covalent Radius, Ionic Radius, Atomic Radius
Document Summary
Mendeleyev realized that when the elements were listed in order of their atomic weights, their properies repeated in a series of periodic intervals. Periodic law - refers to the periodic recurrence of certain physical and chemical properies when the elements are considered in terms of increasing atomic number. An adaptaion of lothar meyers 1870 plot of atomic volume against atomic number. Metals are present on the descending slopes and in the valleys. Mendeleev"s work atracted more atenion than that of meyer because: mendeleev let blank spaces in his table for undiscovered elements, he corrected some atomic mass values. Atomic radius: diicult to deine since the probability of inding an electron decreases with increasing distance from the nucleus, but nowhere does the probability fall to zero: atomic radius is therefore deined in terms of internuclear distance. Covalent radius: one half the distance between the centers of two atoms that are bonded covalently.
