When an atom receives or takes on electrons it becomes this? proton, electron, electric charge, attract, repel, positive ion, negative ion

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. : )

Evaluate this exponential expression,8. (2 + 3)2 – 42

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?