Answer:
just line up their atomic numbers one after the other starting from lithium(1st two can be easily memorised, right?)
LiBeBCNOFNe NaMgAlSiPSClAr
all u have to do is remember this then potassium(K) and calcium(Ca) come after argon
pronounce it as: libibeknofnae naamgaalsipsklar
If you later decide to learn them out of order, try http://www.jacksonlearning.com/atomicnumbers