Verified Answer :

premedchemist

This can be explained by the periodic trend that atomic size decreases from left to right in a given period. This is due to the effective nuclear charge increase, or how much more the nucleus pulls in on the electrons. Therefore Sodium (Na) has the largest atomic radius.

The largest atomic radius in period 3 is of sodium atom (Na).

Given:

The elements of the period 3.

To find:

The element with the largest atomic radius.

Solution:

The elements of period 3:

Na, Mg, Al, Si, P, S, Cl, Ar

  • On moving from left to right in the period the atomic radii of the elements decreases. As effective nuclear charges increases on the outermost electrons by which atomic radius decreases.
  • On moving down in the group the atomic radii of the elements increase.  As a new principal quantum number is added to the atoms of elements.

So, the decreasing order of atomic radii of the elements in the period 3:

Na > Mg > Al > Si > P > S > Cl > Ar

The largest atomic radius in period 3 is of sodium atom (Na).

Learn more about trends of atomic radius in a periodic table here:

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