1-ATOMS-MOLECULES-AND-IONS (1).pdf

Atoms, Molecules, and Ions Atomic Symbol, Atomic Number, and Mass Number X = Atomic symbol of the element A = mass number; A = Z + N Z = atomic number (the number of protons/number of electrons in the nucleus) N = number of neutrons in the nucleus Atomic Symbol, Atomic Number, and Mass Number A...

Atoms, Molecules, and Ions Atomic Symbol, Atomic Number, and Mass Number X = Atomic symbol of the element A = mass number; A = Z + N Z = atomic number (the number of protons/number of electrons in the nucleus) N = number of neutrons in the nucleus Atomic Symbol, Atomic Number, and Mass Number Atomic Symbol, Atomic Number, and Mass Number Atomic Symbol, Atomic Number, and Mass Number  Isotopes Isotopes are atoms of an element with the same number of protons, but a different number of neutrons. Isotopes have the same atomic number, but a different mass number. Isotopes Isotopes are atoms of an element with the same number of protons, but a different number of neutrons. Isotopes have the same atomic number, but a different mass number. Atomic Symbol, Atomic Number, and Mass Number Atomic Symbol, Atomic Number, and Mass Number Activity Determining the Number of Subatomic Particles in the Isotopes of an Element Solution: Atomic Masses of the Elements Atomic mass (also called atomic weight) of an element, the average of the masses of its naturally occurring isotopes weighted according to their abundances. Atomic Masses of the Elements Assignment: Boron (B; Z = 5) has two naturally occurring isotopes. 10 11 Find the percent abundances of 𝐵 and 𝐵 given these data: atomic mass of B = 10.81 g/mol, isotopic 10 mass of 𝐵 = 10.0129 g/mol, and isotopic mass of 11 𝐵 = 11.0093 g/mol. Atoms, Molecules, and Ions Ion An ion is an atom or molecule that carries an electric charge. Ions are identified by the use of a superscript to show the sign and size of their electric charge. Ion When a metal atom loses one or more electrons, it becomes a cation (positively charged ion). When a nonmetal atom gains one or more of the electrons lost by the metal atom, it becomes an anion (negatively charged ion) Naming Binary Ionic Compounds For all ionic compounds, the name and formula lists the cation first and the anion second. In a binary ionic compound, both the cation and the anion are monatomic. The name of the cation is the same as the name of the metal. Many metal names end in -ium. The anion is named by adding the suffix -ide to the root of the nonmetal name. Calcium and bromine form calcium bromide. a) magnesium nitride b) cadmium iodide c) strontium fluoride d) cesium sulfide Determining Formulas of Binary Ionic Compounds Write the formulas for each of the compounds a) magnesium nitride b) cadmium iodide c) strontium fluoride d) cesium sulfide