Analyze: An isotope is an alternative form of an element. Each isotope of an element has the same number of protons, but a different number of neutrons. The isotope is represented by the atomic symbol and mass number, such as He4. Some isotopes are stable, while others are radioactive, which means the atoms decay over time and emit radiation. . What are the stable isotopes of boron? . What are the stable isotopes of carbon? . List two radioactive isotopes of nitrogen: Draw diagrams: Create an electron dot diagram for each of the elements below. Use Gizmo to help you do this. To check your work, turn on the Show electron dot diagram. You do not have to turn your drawings, this is just practice. H He Li Be B C N O F Ne Na Mg Al Si P S Cl ArAnalyze: What do the elements in each column of the periodic table have in common in terms of electron dot structure? What does this suggest about how the periodic table is organized? 3. Upload a drawn picture of these three atoms (be sure to Show the number of protons, neutrons, electrons, and electron clouds) - (try to do these Without the Gizmo in possible): 1) A magnesium atom with atomic number of 12, atomic mass of 24, and neutral charge 2) A magnesium atom with atomic number of 12, atomic mass of 25, and neutral charge 3) A magnesium atom with atomic number of 12, atomic mass of 24, and a positive charge of +2