Total 8,232. Note: In addition to its drugstores, Walgreens also operates home care facilities and specialty, institutional and mail service pharmacies. Its Take Care Health Systems subsidiary manages more than 400 convenient care clinics at Walgreens drugstores.
These different versions of hydrogen are called isotopes. All isotopes of a particular element have the same number of protons, but have a different number of neutrons. If you change the number of neutrons an atom has, you make an isotope of that element.Currently, scientists know of 118 different elements.Some, like gold, silver, copper and carbon, have been known for thousands of years.f you change the number of neutrons an atom has, you make an isotope of that element. Currently, scientists know of 118 different elements. Some, like gold, silver, copper and carbon, have been known for thousands of years.
  One element differs from another element by the number of protons in their atoms. The number of protons in the atom is known as the atomic number. Also one isotope of â¦ an element differs from another isotope of the same element by the number of neutrons in their atoms.lements are made of three things: electrons, neutrons and protons. The electrons give its charge, the neutrons keep it all in place and the protons tell you what element it i â¦ s. Therefore, in order to change an element to another, you either add or remove protons.