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.
Well, it depends. Every isotope of a particular element has the same number of protons (by definition). All carbon isotopes have 6 protons; all nitrogen isotopes have 7 protons, all uranium isotopes have 92 protons, etc. Each element can have varying number of neutrons in addition to the protons that make the element. For carbon, for example, all carbon isotopes have 6 protons, but carbon-11 has 5 neutrons, carbon-12 has 6 neutrons, carbon-13 has 7 neutrons, carbon-14 has 8 neutrons, etc. Some of these isotopes are stable (carbon-12 and carbon-13); some are radioactive (carbon-11 and carbon-14). If you want to find out the number of protons and neutrons in an isotope, it is pretty straightforward.