AtomLabels

is an option for MoleculePlot and MoleculePlot3D that specifies what labels and label positions should be used for atoms.

Details

	None	use no atom labels
	All	always use atom labels
	Automatic	automatically label atoms
	"AtomIndex"	use the atom index as a label
	"AtomChirality"	use the atom chirality as a label
	MoleculeProperty[…]	a molecule property for atoms
	EntityProperty["Element",…]	an element property
	{a₁lbl₁,a₂lbl₂,…}	label atom a_i with lbl_i etc.
	{patt₁lbl₁,patt₂lbl₂,…}	label atoms matching the pattern patt_i with lbl_i

Any expression can be used as a label.
Use MoleculeValue["Properties"]["AtomProperties"] to list atomic properties for labeling.
Placed[lbl,pos] can be used to place labels in relative position to the vertex box:

	Tooltip, StatusArea	show as tooltip or in status area on mouseover
	Center	place label at center of atom
	Before,After,Below,Above	place label outside before, after, etc.
	Left,Right,Bottom,Top	place label inside to the left, right, etc.
	{Before,Below},{After,Below},…	place label outside at corner before/below etc.
	{Left,Bottom},{Right,Bottom},…	place label inside at corner left/bottom etc.
	{{v_x,v_y},{l_x,l_y}}	scaled position {l_x,l_y} in the label at scaled position {v_x,v_y} in the atom

open allclose all

Label all atoms by their index:

Label individual atoms:

Label chiral atoms:

Use a pattern to place labels only on specific atoms:

Use multiple patterns to specify different labels:

Use Placed with symbolic locations to control label placement, including outside positions:

Place labels at symbolic outside corner positions:

Place labels at symbolic inside positions:

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