Which is bigest atom?
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Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
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Cesium has a large pm valence shell and a relatively low effective nuclear charge. valence electron The valence shell (the outer 'peel' of the atom) is largest in atoms at the bottom of the periodic table. A low nuclear valence shell charge means that electrons can wander further, on average, from the nucleus.
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