Representing atom

We will consider the qty per each colour and diameter for production 14 black spheres (carbon), 35 mm in diameter. 30 white spheres (idrogeno) of 30 mm in diameter. 12 areas of red (oxygen), 35 mm in diameter. 04 green areas (chlorine) of 30 mm in diameter. 02 lilac spheres (iodine) of 30 mm in diameter. 04 areas of light blue (nitrogen), 35 mm in diameter. 02 spheres orange colored (bromo) of 30 mm in diameter. 04 yellow spheres (sulfur) of 30 mm in diameter. The pieces should be preferably of plastic or material constant tamper resistant, nontoxic, easy to assemble, they must allow for the perfect coupling demonstrate basic molecular structures.