. ▁▁▁▁ ▁Electron ▁density ▁plot ▁– ▁shows ▁the ▁electron ▁density ▁determined ▁either ▁cry stal log raph ically ▁or ▁using ▁quantum ▁mechan ics ▁rather ▁than ▁distinct ▁atoms ▁or ▁b onds . ▁▁ ▁Ball ▁and ▁stick ▁– ▁atomic ▁nuc lei ▁are ▁represented ▁by ▁spher es ▁( ball s ) ▁and ▁the ▁b onds ▁as ▁st icks . ▁▁▁ ▁Space fill ing ▁models ▁or ▁C PK ▁models ▁( also ▁an ▁atomic ▁color ing ▁scheme ▁in ▁representations ) ▁– ▁the ▁mole c ule ▁is ▁represented ▁by ▁over la pping ▁spher es ▁representing ▁the ▁atoms . ▁▁▁▁ ▁Cart oon ▁– ▁a ▁representation ▁used ▁for ▁prote ins ▁where ▁loops , ▁beta ▁sheets , ▁and ▁alpha ▁hel ices ▁are ▁represented ▁diagram matically ▁and ▁no ▁atoms ▁or ▁b onds ▁are ▁explicitly ▁represented ▁( e . g . ▁the ▁protein ▁back bone ▁is ▁represented ▁as ▁a ▁smooth ▁pipe ). ▁ ▁The ▁greater ▁the ▁amount ▁of ▁l one ▁pairs ▁contained ▁in ▁a ▁mole c ule , ▁the ▁smaller ▁the ▁angles ▁between ▁the ▁atoms ▁of ▁that ▁mole c ule . ▁The ▁V SE PR ▁theory ▁predict s ▁that ▁l one ▁pairs ▁rep el ▁each ▁other , ▁thus ▁pushing ▁the ▁different ▁atoms ▁away ▁from ▁them . ▁ ▁See ▁also ▁▁ ▁J em mis ▁m no ▁rules ▁Lewis ▁structure ▁ ▁M ole cular ▁design ▁software ▁ ▁M ole cular ▁graphics ▁ ▁M ole cular ▁mechan ics ▁ ▁M ole cular ▁mod elling ▁ ▁M ole c ule ▁editor ▁ ▁Poly hed ral ▁ske let al ▁electron ▁pair ▁theory ▁ ▁Quant um ▁chem istry ▁ ▁Top ology