Every electron in an atom has a principal quantum number n and an azimuthal quantum number l. In a chromium atom (Z = 24) in its ground state, how many electrons have n + l = 4? Take care with the ground-state configuration of chromium, which does not follow the simple filling order.

ChemistryMediumHigh School (11–12)Structure of the Atom › Electronic Configuration and Valency JEE Main

Every electron in an atom has a principal quantum number $n$ and an azimuthal quantum number $l$ . In a chromium atom ( $Z = 24$ ) in its ground state, how many electrons have $n + l = 4$ ? Take care with the ground-state configuration of chromium, which does not follow the simple filling order.

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← Count the unpaired electrons of each atom and ion below in its ground state. In which pair are the two counts equal? Chromium has atomic number 24, manganese 25, iron 26, cobalt 27 and copper 29. Think about the unusual configurations of chromium and copper, and about which electrons leave first when a positive ion forms.In a photocell experiment, ultraviolet light of wavelength 300 nm shines on the plate, and then violet light of wavelength 400 nm. The fastest photoelectrons knocked out by the ultraviolet light carry 3 times the kinetic energy of the fastest ones knocked out by the violet light. Find the work function of the plate. Use hc = 1240.8 eV nm. →

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