8. Which of the following electron configurations belongs to an atom that is most likely to be involved in a covalent bond? (A) 1s2 2s2 2p6 3s2 (B) 1s2 2s2 2p6 3s2 3p3 (C) 1s2 2s2 2p6 (D) 1s2 2s2 2p6 3s2 3p6 (E) none of these

7. Which of the following statements is incorrect? (A) NF3 is a polar molecule. (B) The hybridization of the central atom is sp3 in ? (C) According to the molecular orbital model, the bond order of P2 molecule is three. (D) A material is made from Al, Ga, and As. The mole fraction of each element is 0.25, 0.26, and 0.49, respectively. This material would be an p-type semiconductor. (E) none of these

8. Which of the following electron configurations belongs to an atom that is most likely to be involved in a covalent bond?
(A) 1s² 2s² 2p⁶ 3s²
(B) 1s² 2s² 2p⁶ 3s² 3p³
(C) 1s² 2s² 2p⁶
(D) 1s² 2s² 2p⁶ 3s² 3p⁶
(E) none of these

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