Atom Query Properties Dialog

    The Atom query properties dialog provides quick access to the most frequently used query properties in the Advanced tab of Atom Properties Dialog.


    Available from the Atom toolbar, Query Atoms combo box, or by pressing the . key.

    The table below lists all the available properties along with a description and available values.

    Property Description Tool Available values
    Total Hydrogen (H) The total number of hydrogen substituents. .H+ H0-H4
    .H- H4-H0
    Implicit Hydrogen (h) The number of implicit hydrogen substituents. .h+ h0-h4
    .h- h4-h0
    Bond order (v) Total bond order. In some cases, it is referred to as valence. .v+ v0-v8
    .v- v8-v0
    Connections (X) The number of substituents including hydrogens. .X+ X0-X3
    .X- X3-X0
    Ring count (R) The number of rings the atom is a member of. .R+ R0-R6
    .R- R6-R0
    Smallest ring size (r) Size of the smallest ring the atom is a member of. .r+ r0-r30
    .r- r30-r0
    Ring bond (rb) Number of ring bonds next to the atom. .rb+ rb0-rb4
    .rb- rb4-rb0
    .rb* as drawn
    Substitutions (s) Substitution count: the number of non-hydrogen substituents plus the number of isotopic hydrogen substituents. .s+ s0-s6
    .s- s6-s0
    .s* as drawn
    Unsaturated (u) Unsaturated atom: an atom that has a double, triple, or aromatic bond. .u u
    Aromaticity (a/A) It defines whether the atom has at least one aromatic bond (a) or only aliphatic (A) bonds. .a/A a, A