{"id":18057,"date":"2025-06-12T20:51:29","date_gmt":"2025-06-12T20:51:29","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=18057"},"modified":"2025-06-12T20:51:31","modified_gmt":"2025-06-12T20:51:31","slug":"write-the-lewis-structure-identify-and-name-the-molecular-shape-and-draw-the-3d-structures-of-the-following-molecules","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/write-the-lewis-structure-identify-and-name-the-molecular-shape-and-draw-the-3d-structures-of-the-following-molecules\/","title":{"rendered":"Write the Lewis structure, identify and name the molecular shape and draw the 3D structures of the following molecules"},"content":{"rendered":"\n

Write the Lewis structure, identify and name the molecular shape and draw the 3D structures of the following molecules: a.) PH3 b.) H2S c.) Which molecule has the largest angle(s) between bonds? Why?<\/p>\n\n\n\n

The correct answer and explanation is:<\/strong><\/mark><\/p>\n\n\n\n

Sure! Here’s a complete answer for PH\u2083 and H\u2082S, including Lewis structures, molecular geometry, 3D shape, bond angles, and analysis:<\/p>\n\n\n\n

\n\n\n\n

a.) PH\u2083 (Phosphine)<\/strong><\/h3>\n\n\n\n
    \n
  • Lewis Structure:<\/strong>H | H - P - H :<\/code>\n
      \n
    • Phosphorus (P) has 5 valence electrons.<\/li>\n\n\n\n
    • Forms 3 single bonds with hydrogen atoms.<\/li>\n\n\n\n
    • One lone pair remains on phosphorus.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • Molecular Shape (VSEPR):<\/strong> Trigonal pyramidal<\/strong><\/li>\n\n\n\n
    • 3D Structure:<\/strong>
      The molecule looks like a pyramid with a lone pair at the top pushing the three H atoms downward.<\/li>\n\n\n\n
    • Bond Angle:<\/strong> ~93.5\u00b0<\/strong><\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n

      b.) H\u2082S (Hydrogen sulfide)<\/strong><\/h3>\n\n\n\n
        \n
      • Lewis Structure:<\/strong>H - S - H .. ..<\/code>\n
          \n
        • Sulfur (S) has 6 valence electrons.<\/li>\n\n\n\n
        • Forms 2 single bonds with hydrogen.<\/li>\n\n\n\n
        • Has 2 lone pairs on sulfur.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • Molecular Shape (VSEPR):<\/strong> Bent (or V-shaped)<\/strong><\/li>\n\n\n\n
        • 3D Structure:<\/strong>
          The two H atoms are bent downward with two lone pairs on top, similar to a water molecule.<\/li>\n\n\n\n
        • Bond Angle:<\/strong> ~92.1\u00b0<\/strong><\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          c.) Which molecule has the largest bond angle? Why?<\/strong><\/h3>\n\n\n\n
            \n
          • Answer:<\/strong> PH\u2083<\/strong> has the larger bond angle (~93.5\u00b0) compared to H\u2082S (~92.1\u00b0).<\/li>\n\n\n\n
          • Explanation (300 words):<\/strong><\/li>\n<\/ul>\n\n\n\n

            Molecular shape and bond angles in molecules are determined using the VSEPR (Valence Shell Electron Pair Repulsion) theory. This theory assumes that electron pairs (bonding and lone pairs) around a central atom will arrange themselves as far apart as possible to minimize repulsion.<\/p>\n\n\n\n

            In PH\u2083<\/strong>, the phosphorus atom has three bonded hydrogen atoms and one lone pair. The resulting shape is trigonal pyramidal<\/strong>. The lone pair-bond pair repulsion slightly compresses the ideal tetrahedral angle (109.5\u00b0) to about 93.5\u00b0<\/strong>, but because phosphorus is a larger atom with more diffuse orbitals, the repulsions are less intense.<\/p>\n\n\n\n

            In contrast, H\u2082S<\/strong> has two bonding pairs and two lone pairs on sulfur, leading to a bent<\/strong> geometry. The two lone pairs exert strong repulsive forces on the bonding pairs, causing a smaller bond angle (~92.1\u00b0). Also, sulfur is more electronegative and has smaller orbitals compared to phosphorus, resulting in more localized electron repulsion and tighter bond angles.<\/p>\n\n\n\n

            Thus, although both molecules are non-linear due to lone pairs, PH\u2083 has the larger bond angle<\/strong> because it has fewer lone pairs and a central atom with more diffused orbitals, which reduces electron-electron repulsion and allows for slightly wider spacing between bonds compared to H\u2082S.<\/p>\n","protected":false},"excerpt":{"rendered":"

            Write the Lewis structure, identify and name the molecular shape and draw the 3D structures of the following molecules: a.) PH3 b.) H2S c.) Which molecule has the largest angle(s) between bonds? Why? The correct answer and explanation is: Sure! Here’s a complete answer for PH\u2083 and H\u2082S, including Lewis structures, molecular geometry, 3D shape, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-18057","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/18057","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=18057"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/18057\/revisions"}],"predecessor-version":[{"id":18058,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/18057\/revisions\/18058"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=18057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=18057"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=18057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}