Multiple choice How many VSEPR electron group are found in NH_3? The Lewis symbo
ID: 960886 • Letter: M
Question
Multiple choice How many VSEPR electron group are found in NH_3? The Lewis symbol for a group 1VA element would have dots representing the following number of valence Which of the following elements would form a polar covalent bond? Sulfur and Oxygen; Potassium and Iodine Magnesium and Bromine; Bromine and Bromine What types of electron pairs are used in VSEPR calculations? Core electrons; Bonding electron pairs; Non-bonding electron pairs Both b and c; None of these Which of the following pairs of elements would form a non-polar covalent bond? Nitrogen and oxygen Fluorine and fluorine Calcium and iodine Potassium and bromine none of theseExplanation / Answer
Solution.
1. The structure of ammonia is AX3E, therefore, it contains one electron group.
2.Group IVA si represented by C, Si, Ge, Sn and Pb. The valence of these atoms is 4.
3. A polar covalent bond is of electronegativity difference 0.5-2.0. Electronegativity difference between Sulfur and Oxygen is E(S)-E(O) = |2.5-3.5| = 1.0. Therefore, the bond is polar covalent.
4. VSEPR calculations take into account bonding electron pairs and non-bonding electron pairs.
5. A non-polar covalent bond is of electronegativity difference less than 0.5. Classical non-polar bond is formed between the atoms of the same element. Therefore, the bond between fluorine and fluorine is a non-polar covalent bond.
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