How is the atomic number of the second most abundant element in the Earth’s crust related to the third mission to land on Earth’s moon?

CellarDoor

The number is 14. Silicon has an atomic number of 14 and is the Earth's crust second most abundant element (25.7% by mass): http://en.wikipedia.org/wiki/Silicon Apollo 14 was the third mission to land on the moon. Apollo 11 was the first; Apollo 13 turned back without landing. http://en.wikipedia.org/wiki/Apollo_14 Aug 11 09, 7:16 PM

Arpeggionist

As I understand it, Apollo 14's mission (which was to accomplish the objectives Apollo 13 couldn't) involved tests of the lunar surface. These tests would determine seismic activity, chemical makeup, and the answer to the question of whether the Moon has any atmosphere at all. Lunar samples from all the Apollo missions confirmed just how similar the Moon's chemical makeup is to Earth's crust, so any element that is abundant in our crust is bound to be related closely enough to the Moon and hence to the Apollo program. (http://en.wikipedia.org/wiki/Apollo_14#Mission_parameters) Aug 11 09, 7:26 PM

BRY2K

Correct and all true...well done, both of you. Aug 11 09, 7:27 PM