Consider an electrically neutral iron atom, whose atomic number is 26. A) The at

Question

Consider an electrically neutral iron atom, whose atomic number is 26.

A) The atom has electrons in which of the following sets of shells?
- the K, L, and M shells
- The K, L, M, and N shells
- the K and L shells

B) When a vacancy, or hole, occurs in the Kshell, one electron from an outer energy shell makes a transition to fill the hole. The result of this transition is the emission of an X-ray photon, called a K X ray, which has a definite wavelength, as indicated by the appearance of a line in the spectrum. How many lines will be in the spectrum of iron when KX rays are emitted?
- 1
- 2
- 3

Explanation / Answer

A) The K, L, M, and N shells

because last electron goes to 4s

B) 3

transition 4-3-2-1 or 4-2-1 or 4-1

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