## Chemistry: The Central Science (13th Edition)

Published by Prentice Hall

# Chapter 6 - Electronic Structure of Atoms - Exercises: 6.73b

#### Answer

Core electrons are inner-shell electrons. They have the electron configuration of the nearest noble gas element, which makes up the noble gas core. The core electrons are not involved in chemical bonding.

#### Work Step by Step

For example, $$Li: 1s^22s^1$$ $1s^2$ refer to 2 core electrons. And $1s^2$ is also the electron configuration of the noble gas helium, we can also write $$Li: [He]2s^1$$

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