how can i tell which generation my nexus 7 is
Nexus 7 (2013) The second iteration of the 7 in (180 mm) tablet, code named "Razor",[11] has various upgrades from the previous generation, including a 1.5 GHz quad-core Snapdragon S4 Pro processor, 2 GB of memory, a 1920×1200 pixel display (323 pixels per inch; 127 ppcm), dual cameras (1.2 MP front, 5 MP rear), stereo speakers, built-in inductive Qi wireless charging, and a SlimPort (via micro USB connector) capable of full high-definition video output to an external display.