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In general, an atom is more polarizable the larger it is and an atom has more polarizing power the smaller it is. Therefore, polarizability increases down a group because atomic size increases and larger electron clouds distort more easily. Polarizability would decrease across a period because of increasing effective nuclear charge (Zeff). Smaller, more highly charged cations have more polarizing power. Therefore, polarizing power increases from left to right of the periodic table. However, cations become larger as you go down a group so their polarizing power decreases.
AlyssaBei_1B wrote:For polarizability, would the trend decrease across a period from right to left because the atoms are getting smaller from right to left?
Yes. Also because the more negatively charged the atom is, the more polarizability.
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