Schaum”s outline of college chemistry pdf

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This is a list of sources that each list metalloids: elements classified as metalloids. The sources are listed in chronological order.

Individual lists share common ground, with variations occurring at the margins. The elements most often regarded as metalloids are boron, silicon, germanium, arsenic, antimony and tellurium. Wikipedia generally categorises these six as metalloids, with the addition of astatine. Other sources may subtract from this list or add a varying number of other elements.

Recognition status, as metalloids, of some elements in the p-block of the periodic table. Percentages are median appearance frequencies in the list of metalloid lists. This table show which elements are included in each of 194 different lists of metalloids. The ‘citations’ rows show how many and what percentage of the authorities consider each element to be a metalloid, with qualified citations counted as one-half.

It is counted as 0. There is an average of 7. 15 elements per metalloid list. The diamonds in the graph mark the mean appearance frequency of each cluster.

H, Ga, S, I, Pb, Fl, Uup, Lv, Uus. 7423x and an R2 value of 0. The elements commonly classified as metalloids are boron, silicon, germanium, arsenic, antimony and tellurium.

The status of polonium and astatine is not settled. Herman, Hoffmann and Ashcroft, on the basis of relativistic modelling, predict astatine will be a monatomic metal.