Atoms, Elements, and CompoundsElements, Compounds, and MixturesDescribe the differences between elements, compounds, and mixturesAtomic Structure and the Periodic TableDescribe the structure of the atom as a central nucleus containing neutrons and protons surrounded by electrons in shellsState the relative charges and relative masses of a proton, a neutron, and an electronDefine proton number / atomic number as the number of protons in the nucleus of an atomDefine mass number / nucleon number as the total number of protons and neutrons in the nucleus of an atomDetermine the electronic configuration of elements and their ions with proton number 1 to 20, e.g., 2,8,3State that Group VIII noble gases have a full outer electron shellThe number of outer shell electrons is equal to the group number in Groups I to VIIThe number of occupied electron shells is equal to the period numberIsotopesDefine isotopes as different atoms of the same element that have the same number of protons but different numbers of neutronsInterpret and use symbols for atoms, e.g., C-12, and ions, e.g., Cl-35State that isotopes of the same element have the same chemical properties because they have the same number of electrons and therefore the same electronic configurationCalculate the relative atomic mass of an element from the relative masses and abundances of its isotopes