Electrons Energy Levels And Atomic Orbitals

Which statement most accurately defines an atomic orbital?

What is the total electron capacity of the third shell (n = 3)?

Which sequence correctly shows sub-shells in order of increasing energy?

What is the correct full ground-state electronic configuration of a copper atom (Z = 29)?

Which species is correctly classified as a free radical?

What is the electronic configuration of the Fe³⁺ ion (Fe has Z = 26)?

According to Hund’s rule, why do electrons in the 2p sub-shell occupy separate orbitals with parallel spins before pairing?

Which statement about the shapes and orientation of p orbitals is correct?

A chemist exposes Cl₂ gas to ultraviolet light, generating reactive species that initiate further reactions. Which feature of the species formed best explains its high reactivity?

How many unpaired electrons are present in a ground-state iron atom (Z = 26)?

Which is the correct shorthand electronic configuration of the O²⁻ ion?

In the electrons-in-boxes representation of a nitrogen atom, what is shown for the 2p sub-shell?

A student claims that the V³⁺ ion (V has Z = 23) has the configuration [Ar] 3d⁰4s². Which statement correctly identifies the error?

Which atom in its ground state has exactly one unpaired electron?