When writing a poem, a line break can be used in a way that resembles electrons in a covalent bond. (My example from my poem The Twilight Sad). Here is how it looked originally.
I should never remember the Captain
Or listen to the songs I remember
His voice is the Twilight-
Sad in the car
Already, a line break is unified in the last two lines. The Twilight Sad is a band which the poem is named after and reminiscing. However, the phrase Twilight Sad is broken between two lines. This allows the words to have multiple metaphors. (Reference to the band is an image). Another image is that of sad in the car. This is in reference of a memory where I was listening to the band in the car while in a sad mood which happened at twilight; yet another metaphor). This instance represents more of an ionic bond (I think); where the different “electrons” (words) between the two “atoms” (lines) fill each other’s needs to bring them together.
Look now at the second and third line. Revising the poem, I decided to push I remember to its own line.
Or listen to the songs
His voice is the Twilight
Doing this emphasizes that the phrase I rememer does not belong to one or the other. Rather, it is shared (like an electron in a covalent bond) between them, bringing the lines and the poem together. Without I remember, the two thoughts listen to the songs and his voice is the Twilight would have to be punctuated, separating them. However, listen to the songs I remember and I remember his voice in the Twilight both make sense as phrases. This, I remember is its own line in order to tie the two ideas together.
So, lines and words in poems are atoms and electrons. Poetry and chemistry.