应用化学专业英语第二版万有志主编版(课后答案和课文翻译)

E

A. Yes, they have same electron numbers. B. Yes, they have same electron arrangement.

C. No, sodium ion is still a form of sodium, not atom but cations. D. No, sodium ion is a charged particle, while the neon atom is a neutral one.

E. C and D.

5. It is impossible for Tom to judge such important affair B

A. as a rule of thumb. B. by rule of thumb. C. though a rule of thumb. D. by experiment.

6. What happens during Na + Cl Na+Cl- D

A. the nuclei of each ions are changed. B. the inner energy level of electrons changed. C. A and B.

D. The outermost energy level is altered.

7. Is there any order or any pattern to the way that the electron dot are draw? C

A. No, there is no any order. B. Yes, the p orbitals are filled firstly.

C. Yes, the s orbital is filled firstly and the p orbitals.

D. Yes, but the p orbitals is filled willfully. V. Translation

Chlorine is more electronegative than hydrogen. In a hydrogen chloride molecule, the chlorine atom has a much greater attraction than the hydrogen atom for the shared electron pair. Because the shared electron are held more tightly by the chlorine atom, the chlorine end of the molecule is more negative than the hydrogen end. If you think of an orbital as a fuzzy-looking cloud, then the cloud is denser near the chlorine atom. When the electrons in a covalent bond are not equally shared, the bond is said to be polar. Thus the bonding in hydrogen chloride is described as polar covalent. Whereas the bonding in the hydrogen molecule or in the chlorine molecule in nonpolar covalent. The polar covalent bond is not an ionic bond. In an ionic bond, one atom completely losed an electron. In a pol

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