Which spectral line in the potassium line spectrum has the longest wavelength? blue violet green orange

For the following atoms, fill out the electron configuration and write out the arrow notation:   Electron  Configuration 1s 2s 2p 3s 3p 4s 3d Mg                 Ge                 Si                 Ca^2+                 Cl^-

How many electrons are present in the d sublevel of a Fe^ 3+ ?

Using the Bohr model, pick which electronic transition will emit a photon with the shortest wavelength. Group of answer choices n = 1 → n = 3 n = 2 → n = 1 n = 6 → n = 4 n = 3 → n = 2

Fix any errors in these proposed electron configurations. number of electrons in atom 16 5 26 proposed electron configuration 6 15 1p 2s 2p 15²25²35²¹ 15 25 2p 3s 3p 3d

kJ/mol E = Determine the wavelength and frequency for light with energy of 255.6 kJ/mol. nm V = What is the color of light with energy of 255.6 kJ/mol? Refer to the electromagnetic spectrum as needed.

An ion with a +1 charge and ground-state electron configuration [Ar]3d5 An ion with a +1 charge and excited-state electron configuration [Ar]3d5

Convert between number of photons and energy given a particular wavelength. Low level light therapy (LLLT) using RED light was observed to promote wound healing. The daily dose provided was 24 J/cm. Given the wavelength of 635 nm, how many photons were required to deliver the dose to a 1 cm? area?

I am confused how to approach the problem

Consider the transition from the energy levels n = 3 to n = 5. What is the wavelength associated with this transition, in nm? nm In what spectral region does this transition occur? this wavelength is in the ultraviolet this wavelength is in the visible this wavelength is in the infrared Is energy absorbed or released for this transition? energy is absorbed energy is released