Isotope Practice Worksheet Name: Learning Target: Use isotope notation to determine: element name/symbol, atomic number, number of electrons, number of neutrons, number of protons, mass number, atomic number, atomic mass. Isotope Notation: 12 13 14 1. Here are three isotopes of an element: 6 C 6 C 6 C a. The element is: __________________ b. The number 6 refers to the _________________________ c. The numbers 12, 13, and 14 refer to the ________________________ d. How many protons and neutrons are in the first isotope above? _________________ e. How many protons and neutrons are in the second isotope above? _________________ f. How many protons and neutrons are in the third isotope above? _________________ 2. Complete the following chart: Isotope name 235 92 atomic # mass # # of protons # of neutrons # of electrons U 238 92 U 10 5 B 11 5 B 3. Complete the following chart: Element Symbol Atomic Number Number of electrons Number of Neutrons Helium 2 2 Ti 22 73 Gallium Mass number Isotope Notation 50 68 108 28 39 13 6 C 226 88 83 83 127 Ra