Barium (Ba) is an alkaline earth metal found in Group 2 of the periodic table. The number of valence electrons corresponds to the electrons in the outermost shell of an atom. Elements in Group 2 possess two valence electrons. Barium follows this pattern, meaning the correct answer is 2 valence electrons<\/strong>.<\/p>\n\n\n\n Examining the electron configuration of barium provides insight into this conclusion. The atomic number of barium is 56, meaning it has 56 electrons in its neutral state. These electrons arrange themselves within different energy levels, following the order determined by quantum mechanics: 1s\u00b2 2s\u00b2 2p\u2076 3s\u00b2 3p\u2076 4s\u00b2 3d\u00b9\u2070 4p\u2076 5s\u00b2 4d\u00b9\u2070 5p\u2076 6s\u00b2<\/p>\n\n\n\n The highest energy level in this configuration is the sixth shell, which contains two electrons (6s\u00b2). These are the valence electrons responsible for barium’s chemical properties and reactivity. When forming compounds, barium commonly loses these two outer electrons, resulting in the Ba\u00b2\u207a ion. This behavior aligns with the general tendency of Group 2 elements to form divalent cations.<\/p>\n\n\n\n The importance of valence electrons extends to chemical bonding and reactivity. Since barium readily loses its two outermost electrons, it typically forms ionic bonds with nonmetals, such as sulfate (SO\u2084\u00b2\u207b) and chloride (Cl\u207b), creating compounds like barium sulfate (BaSO\u2084) and barium chloride (BaCl\u2082). These interactions illustrate how valence electrons determine the stability and reactivity of an element.<\/p>\n\n\n\n Understanding the number of valence electrons in an atom is essential for predicting chemical behavior, explaining bond formation, and classifying elements within periodic trends. The identification of two valence electrons in barium reinforces its placement in Group 2 and clarifies its common oxidation state of +2 in compounds.<\/p>\n\n\n\n Identify the number of valence electrons for Ba. ? 3 ? 54 ? 8 ? 46 ? 56 The Correct Answer and Explanation is: Barium (Ba) is an alkaline earth metal found in Group 2 of the periodic table. The number of valence electrons corresponds to the electrons in the outermost shell of an atom. 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