Look up sodium in the periodic table (na). then, answer the following questions

the number of electrons in n = 1 level?
the number of electrons in n = 2 level?
the number of electrons in n = 3 level?

choose the letter with the 3 correct answers.
1, 2, 8
8, 2, 1
2, 8, 1

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

Salt in oceans comes from and of rocks