Atomic radii trends | Atomic models and periodicity | High school chemistry | Khan Academy

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Atoms are not all the same size. The relative sizes of the atoms follows a set of trends on the periodic table. Going across a period, the main group elements tend to decrease in atomic radius due to the increased nuclear charge. Going down a group, the main group elements tend to increase in atomic radius due to increased shielding and the addition of new shells to the structure of the atom.
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