Levels of Organization 2.4b: Elements and Isotopes - Carbon Do Now Using your periodic table for each element list the: 1.atomic number 2.atomic

Do Now Using your periodic table,for each element list the: 1.atomic number 2.atomic mass 3.number of protons 4.number of neutrons 5.Number of electronsCarbon Sodium Chlorine Nitrogen

Isotopes Again Chromium - 58Chromium - 63 # of protons2424 # of neutrons3439 # of electrons2424 Nitrogen - 15Nitrogen - 20 # of protons77 # of neutrons # of electronsSubtract the number of protons from the atomic mass to find the number of neutrons. 813 77

Isotopes Anisotopeis one of the different forms of an element, distinguished from one another by different numbers of neutrons. Neutrons determine the isotope. The standard isotope of carbon is12C, commonly called carbon twelve.12 C has six protons and six neutrons, for a mass number of twelve. All of the isotopes of carbon have the same number of protons; therefore,13 C or C-13 has seven neutrons.