As you move down a group (e.g. moving from Al to Ga), the number of electrons/filled orbitals means that the atomic radius of the atom
Question
As you move down a group (e.g. moving from Al to Ga), the number of electrons/filled orbitals means that the atomic radius of the atom
Solution
Increases. As you move down a group in the periodic table, the number of energy levels (or "shells") increases. Each new period corresponds to the addition of a new energy level. More energy levels mean a greater distance between the nucleus and the outermost electrons, which results in a larger atomic radius. Despite the increase in the number of protons in the nucleus, the effect of the additional energy levels is greater, leading to an overall increase in atomic radius.
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