As you move from to on the periodic table, the atomic radius of the atoms increase.

Explanation:

In a group, when we move down from top to bottom then there occurs an increase in atomic size due to addition of electrons into the new shells of elements.

For example, lithium and cesium are same group elements. Atomic radius of lithium is 182 pm and atomic radius of cesium is 343 pm.

Whereas when we move across a period then there occurs a decrease in atomic radius of the atoms due to addition of electrons into the same shell.

Therefore, we can conclude that as you move from top to bottom on the periodic table, the atomic radius of the atoms increase.

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.