How many electrons does oxygen have in its 2nd energy level?

Identify one disadvantage to each of the following models of electron configuration: dot structures arrow and line diagrams written electron configurations type in your answer below.

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.