why are elementary particles structureless?

Element ary particles are considered to be structure less because they are the fundamental building blocks of matter and do not have any internal structure or sub structure . They are the most basic particles that make up everything in the universe , and they are not composed of other particles . \n \n In the Standard Model of particle physics , there are four types of elementary particles : qu arks , le pt ons , phot ons , and gl u ons . Qu arks and le pt ons are ferm ions , which means they obey the Paul i ex clusion principle and can only exist in certain quantum states . Phot ons and gl u ons are bos ons , which means they do not have any internal structure and can exist in any quantum state . \n \n The reason why elementary particles are structure less is that they are the fundamental particles that make up everything in the universe . They are the basic building blocks of matter and do not have any internal structure or sub structure . They are the most basic particles that exist , and they are not composed of other particles . \n \n In summary , elementary particles are structure less because they are the fundamental building blocks of matter and do not have any internal structure or sub structure . They are the most basic particles that make up everything in the universe , and they are not composed of other particles . </s>