What is the speed of electromagnetic waves in a vacuum

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. : )

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough