It's the ATOMIC number for technetium.
The Big Bang Theory Season 6, Episode 8
you get 14, which is
the ATOMIC number of...?
The Big Bang Theory Season 7, Episode 3
My watch is linked to the ATOMIC clock
in Boulder, Colorado.
The Big Bang Theory Season 1, Episode 10
on ATOMIC spectroscopy
when I came across your ad.
The Big Bang Theory Season 9, Episode 8
Now, if you'll excuse me,
the father of the ATOMIC bomb...
The Big Bang Theory Season 4, Episode 3