At the Lab we never use mere digit strings like 23277868 for passwords.
They're too easily defeated by brute-force incremental repetition (think odometer).
Strings of element symbols can be used for doxing, as you illustrate.
Variant [He] [Li] [Co] [Pt] [Er] [S] –> ten-digit string 2327786816 could be our phone #, but U.S. area code 232 is not assigned to any region.
Variant [He] [Li] [C] [H] [O] [Pt] [Er] –> nine-digit string 236187868 could be my Social Security #. Ya think?
Fold around & find out.