Using the periodic table entry below, match the phrases with their corresponding values.

1. number of protons
39
2. atomic mass
8
3. number of electrons in the n = 1 shell
19
4. number of electrons in the n = 3 shell
20
5. number of neutrons
2

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

How does science influence the decisions made about social, economic, and political issues?