Which layer is the thinnest? A. Mantle
B. Oceanic Crust
C. Continental Crust
D. Outer Core

1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have