Answer:
15
Explanation:
the atomic number is the number above the symbol. the number below is the atomic mass.
<span>It allows us to easily locate the data and use it.It will make it easier to find and correctly identify your files, prevent version control problems when working on files collaboratively.organising will help the users to read the big data in simple and understandable manner.</span>
Answer:
oxygen, sulfur, selenium, tellurium, polonium, and ununhexium (O, S, Se, Te, Po, and Uuh, respectively)
Explanation:
i hope it helps all this are 6 valence from electron and form 2-iron.