Question

the atom with the largest atomic radius in period 4 (row 4) is
k
fe
kr
fe

Explanation:

Step1: Recall atomic radius trend

Atomic radius decreases across a period (from left to right) due to increasing nuclear charge which pulls electrons closer.

Step2: Compare elements

In Period 4, \(K\) (Potassium) is on the far left, \(Fe\) (Iron) is in the middle - transition metal region, \(Kr\) (Krypton) is a noble gas on the far right.

Answer:

\(K\) (Potassium) has the largest atomic radius among the given elements in Period 4.