3.14159..

2.71828.. + m

sqr(-1)

well 3.14159... is PI

2.71828 is E plus m gives EM

sqrt(-1) is I

putting this all togeather gives PIEMI throw in a space after PIE and you get PIE MI  now this part would probably be considered a stretch if you add CA to MI you get MICA which is latin for crumb and pie crumb is certainly something that could be found under your nose from time to time.  So I suggest that the next to elements are

299792458  (Speed of light in m/s)

a