chemistry(for exam)

发布网友发布时间：2024-10-22 21:10

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热心网友时间：2024-11-24 16:37

1)electrons in an atom are aranged in shells.The distribution of electrons in the various shells is called electronic arrangement 在原子中，电子以壳层排列，电子在各层中的排列称为电子排布。 2)electrolytes are pounds which allow electricity to pass through them only when molten or in aqueous solution.There is chemical deposition during the conduction. 当一个化合物在融熔状态或溶于水成为溶液时可以导电，该化合物称为电解质。当导通电流时有化学分解发生。 3)An ion is an atom or a group of atoms having an overall electric charge. 离子由单一的原子或原子团(即多于一个原子)所形成，离子带有不为零的电荷。 4)all metals form ions:they usually form cations
Some non-metals form ions:most of these are anions 所有金属都形成离子，通常形成正离子，部份非金属会形成离子，大多数为阴离子。 5)Ionic bond is the strong non-directional electrostatic force of attraction beeen oppositely charged ions.An ionic bond is formed by the trfer of one or moreelectrons from one atom to another 离子键是带相反电性的离子间的无方向性的强大吸引力，离子键是由一粒或多粒电子由一个原子转移到另一个原子所形成的。 6) a molecule is the *** allest part of an element or a pound which can exist on its own under ordinary conditions. 分子是在常温常压下元素或化合物的最细小而又可以单独存在的粒子。