Generic Query Atoms

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Name

Description

A

Any (any atom except hydrogen).

AH

Any atom, including hydrogen.

Q

Hetero (any atom except hydrogen and carbon).

QH

Heteroatom or hydrogen (any atom except carbon).

M

Metal (contains alkali metals, alkaline earth metals, transition metals, actinides, lanthanides, poor(basic) metals, Ge, Sb, and Po).

MH

Metal or hydrogen.

X

Halogen (F, Cl, Br, or I).

XH

Halogen or hydrogen.