The transition elements occupy the middle of the periodic table between (s) and (p) blocks, Including more than 60 elements (more than half the number of known elements), These elements can be classified into...
Elements are arranged in ascending order of their atomic number and according to their electronic configurations, the sequence of elements agrees with the Auf-bau principle, The long-form periodic table is classified into 4 blocks which...
The modern periodic table consists of 7 periods (horizontal rows), and 18 groups (vertical columns), The elements are arranged ascendingly according to their atomic numbers and the way to fill their atomic energy sublevels...
