3
QuizMultiple Choice

Atomic Numbers and Electron Configurations

Question 3 • *26-27 CFISD TX-Chemistry A CR

Each atom of an element has the following electron configuration.1s22s22p63s23p64s23d104p65s24d105p5What is the name of the element?

Answer
A
bromine
B
iodine
C
tellurium
D
xenon

Explanation

Add the electrons shown in the configuration: the total is 53. A neutral atom with 53 electrons has atomic number 53, which is iodine. Therefore, the correct choice is iodine.

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