Definitions containing the term atomic number 40

What does atomic number 40 mean?

/	Number Computing » Texting
NO	Number Governmental » Military
NUM	Number Academic & Science » Mathematics
@==	Atomic bomb Internet » Emoticons
IAEA	International Atomic Energy Agency Governmental » US Government
EIN	Employer Identification Number Business » International Business
PIN	Personal Identification Number Business » Accounting
PIN	Personal Identification Number Governmental » Military
PIN	Personal Identification Number Computing » General
PIN	Personal Identification Number Governmental » Police
AFM	Atomic Force Microscopy Academic & Science » Physics
PIN	Personal Identification Number Computing » Drivers
IAEA	International Atomic Energy Agency Governmental » United Nations
SSN	Social Security Number Governmental » Military
IAEA	International Atomic Energy Agency Governmental » Military
ISBN	International Standard Book Number Miscellaneous » USPS
ISBN	International Standard Book Number Academic & Science » Libraries
S/N	Serial Number Academic & Science » Ocean Science
S/N	Serial Number Governmental » NASA
S/N	Serial Number Governmental » US Government
S/N	Serial Number Medical » Veterinary
S/N	Serial Number Computing » General
S/N	Serial Number Academic & Science » Electronics
S/N	Serial Number Business » General
S/N	Serial Number Governmental » Transportation

zirconium, Zr, atomic number 40(noun): a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon