According to the modern periodic table, which periodic trend is observed as one moves down a group from top to bottom?

💡 Solution & Explanation

As one descends a group in the periodic table, new electron shells are added, increasing atomic radius and shielding inner electrons, which reduces effective nuclear attraction on valence electrons and makes it easier for atoms to lose electrons, thereby increasing metallic character. Atomic radius and metallic character increase down groups, while electronegativity and ionization enthalpy decrease. Dmitri Mendeleev arranged elements by atomic mass, whereas Henry Moseley arranged them by atomic number.