Question

1. based on electron configuration, which atom has the greatest radius? ne3s²3p³ ne3s²3p⁴ ne3s²3p⁵ ar4s² clear all

Explanation:

Step1: Recall atomic - radius trend

Atomic radius increases down a group and decreases across a period. The electron - configuration indicates the position of the element in the periodic table.

Step2: Analyze electron - configurations

The electron - configurations [Ne]3s²3p³ is for P (phosphorus), [Ne]3s²3p⁴ is for S (sulfur), [Ne]3s²3p⁵ is for Cl (chlorine), and [Ar]4s² is for Ca (calcium). P, S, and Cl are in the third period and Ca is in the fourth period.

Step3: Compare atomic radii

Since Ca is in a lower period (fourth period) compared to P, S, and Cl (third period), Ca has the largest atomic radius among them.

Answer:

[Ar]4s²