Which objects are atomic in Mathematica? -

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i looking full list of atomic objects in mathematica (for atomq yields true).

i know about

symbol string integer real rational complex  sparsearray booleanfunction graph

are there others?

ref: http://reference.wolfram.com/mathematica/tutorial/basicobjects.html

edit: continually adding new symbols answers list above.

it appears list needs 1 more object complete:

in[520]:= f = booleanfunction[30, 3];  in[521]:= atomq[f]  out[521]= true

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