Can you tele me about modern periodic table of elements?
In modern periodic table elements are listed in order of increasing atomic number (i.e., the number of protons in the atomic nucleus). Rows are arranged so that elements with similar properties fall into the same columns (groups or families).Groups are vertical columns in the periodic table.In some groups, the elements have very similar properties and exhibit a clear trend in properties down the group. According to quantum mechanical theories of electron configuration within atoms, each row (period) in the table corresponded to the filling of a quantum shell of electrons. There are progressively longer periods further down the table, grouping the elements into s-, p-, d- and f-blocks to reflect their electron configuration. Since the outermost electrons determine chemical properties, those with the same number of valence electrons are grouped together.Progressing through a group from lightest element to heaviest element, the outer-shell electrons (those most readily accessible for part
