Both Uses

atom
in
Wuthering Heights
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Drag him down, and crush him to atoms, that the place which knows him may know him no more!'†
p. 16.7 *

atoms = the smallest parts of any material that cannot be broken up by chemical means
One state resembles setting a hungry man down to a single dish, on which he may concentrate his entire appetite and do it justice; the other, introducing him to a table laid out by French cooks: he can perhaps extract as much enjoyment from the whole; but each part is a mere atom in his regard and remembrance.'†
p. 44.1

atom = the smallest part of any material that cannot be broken up by chemical means

Definitions:

(1) (atom)
the smallest part of any material that cannot be broken up by chemical means; comprised of a nucleus of protons and neutrons surrounded by orbiting electrons
(2) (meaning too rare to warrant focus)