Answer:
D) It has a different unit than atomic mass.
Answer:
D and R are in the same period
Explanation:
remember groups are vertical and periods are horizontal!
Answer:
by the looks of it the answer you have is correct
Explanation:
Valence électrons = are electrons in the outermost shell that is responsible for the chemical reactions of the atoms
It is "LICI" I believe. I could be wrong please let me know if I am wrong.
