Each element has its own emission and absorption lines. What is the best explanation for this? Each element has a specific number of protons and neutrons.
Each element has a distinct number of electrons.
Each element has a unique set of physical characteristics.
Each element has unique energy levels.

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.