Which one of the following can not be prepared by heating their hydroxide Sodium oxide
B calcium oxide
C lead oxide
D zinc oxide

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. : )

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

How do scientists think that gravity affected the formation of our solar system?