Answer is 38/3 or 12.67
3x=38
x=38/3
therefore answer is the one mentioned above
The answer is b. wavelength only
Keep in mind that atomic number is the number of protons in the atom of the element. Therefore, in the case where there are 78 protons, we can conclude that the atomic number of this element is ALSO 78.
Let me know if you need anything else.
- Dotz