What statement correctly compares barium nitrate in scandium nitrate

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. : )

Which type of reaction always has an element and a compound as reactants

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?