Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d11 4p4?

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

When the water vapor cools it condenses select a number that represents his process on the

What are the first three quantum numbers for the electrons located in subshell 2s?