Question

the aufbau principle describes the order of subshells in an atom in terms of energy. higher numbered shells have higher energy. it is complicated by occasional overlapping. the specific order of subshells using the aufbau principle can be found using the diagonal arrow diagram found in chapter 8, and this is the same order found on the periodic table. what is the order of subshells in period 4? 4s 1 2 a. 1s b. 2s c. 3s d. 4s e. 5s f. 6s g. 7s h. 1p i. 2p j. 3p k. 4p l. 5p m. 6p n. 7p o. 1d p. 2d q. 3d r. 4d s. 5d t. 6d u. 7d v. 1f w. 2f x. 3f y. 4f z. 5f aa. 6f bb. 7f

Explanation:

Step1: Recall Aufbau principle

According to the Aufbau principle, the order of filling sub - shells in period 4 is 4s followed by 3d and then 4p.

Step2: Identify correct options

After 4s, the next sub - shell in period 4 is 3d and then 4p. So the blanks should be filled with 3d and 4p.

Answer:

1. Q. 3d
2. K. 4p