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D-block elements: the transition metals in the middle of the periodic table D-electron: responsible for bonding and reactivity Electron configuration: arrangement of electrons in the orbitals of metals
The p-block is on the right side of the periodic table and includes elements from the six columns beginning with column 3A and ending with column 8A (or columns 13-18 on some versions of the periodic table). Helium, which is in the top of column 8A, is not included in the p-block.