Prescription painkillers, also known as opioid pain relievers, include oxycodone, hydrocodone, hydromorphone, and others. Many people who abuse these painkillers become dependent. Some even move on to abusing illegal narcotics, such as heroin.
The first 92 (through uranium) occur naturally. The others are transuranics.. As of 2009, there are 118 ending with ununoctium. All together there are 117 elements on the periodic table, 94 of which occur naturally on earth. According to Wikipedia, there are 117 elements that have been isolated or synthesized, with a gap between element 116 and element 118.
Updated March 14, 2017. There are 118 different elements currently on the periodic table. Several elements have only been found in laboratories and nuclear accelerators. So, you may wonder how many elements can be found naturally. The usual textbook answer is 91. Scientists used to believe that, with the exception of the element technetium, all the elements up to element 92 could be found in nature.