WHY? – The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. 2) As you move across a period, atomic radius decreases.Click to see full answer. In this way, does atomic size increase down a group? Group Trend The atomic radius of atoms generally increases from top to bottom within a group. As the atomic number increases down a group, there is again an increase in the positive nuclear charge. However, there is also an increase in the number of occupied principle energy levels.Additionally, what trend in atomic radius occurs down a group on the periodic table? From top to bottom down a group, electronegativity decreases. This is because atomic number increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius. Considering this, what happens to atomic radii down a group? Atomic radius is the distance from the atom’s nucleus to the outer edge of the electron cloud. In general, atomic radius decreases across a period and increases down a group. Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.Why does the atomic size increase down the group?As one moves down the group there is significant jump in the size of the nucleus (Protons (atomic number) + Neutrons). The additions of new shells increases the distance between nucleus and valance electrons. this increases the pull effect of nucleus resulting in the increase in atomic radius of the atom.
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