here's the datasheet>>(http://www.abracon.com/Resonators/abm3b.pdf) to the crystals I'm using ,these are typical 5 x 3.2mm and 16Mhz , will it workout all fine without connecting the GND contacts, I have PCB not recognizing the ATmega32u4 so maybe that;s because GNDs pins on the crystal need to be connected too?