Question

which of the following sublevels has the highest energy?
a 3d
b 4s
c 3s
d 3p

Explanation:

Step1: Recall energy order

The energy order of electron sublevels follows the Aufbau principle. The general order (from lower to higher energy) for these sublevels is: \(3s < 3p < 4s < 3d\).

Step2: Compare the options

• Option a: \(3d\)
• Option b: \(4s\) (energy less than \(3d\))
• Option c: \(3s\) (lowest among these)
• Option d: \(3p\) (energy less than \(4s\) and \(3d\))

From the order, \(3d\) has higher energy than \(4s\), \(3s\), and \(3p\).

Answer:

a. 3d