Circle the element in each of the following pairs with the greater atomic size:
a) lithium or boron
b) magnesium or strontium
c) cesium or lead
d) sodium or argon

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?