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...Assignment on periodic classification of element q why was it necessary to change the basis from atomic mass number a what is metalloid b give names metalloids in table along with their c which groups are they located list three anomalies mendeleev s were renamed by modern law limitations newlands octaves name elements that have single electron outermost shells two electrons heir filled calcium surrounded numbers and these physical chemical properties resembling can following be classified as dobereiner triad na si cl mg ca how many periods there do size metallic character vary we move down group left right period x y ad z having respectively react oxygen form oxides arrange increasing order basic nature reason for your answer describe oxide third across write electronic configuration argon state reasons placing chlorine bromine i same an has its find valency examine if this will or not halogens placed separate balance does each type ions formed them d any only one shell property meant...