There are just as many protons in the nucleus as electrons______ around it.A、rev

游客2023-09-05  22

问题 There are just as many protons in the nucleus as electrons______ around it.

选项 A、revolving
B、spinning
C、rotating
D、spiraling

答案 A

解析 题意是:在原子核中的质子数与______ 它们的电子数相同。  [A] revolving“旋转,绕转”,指某一物体沿一定的轨道围绕着另一物体旋转,符合题意。 [B] spinning“旋转,自转”,指人或物围绕着自身轴心或外部某一点快速地进行圆周运动;[C]rotating“自转,使转动”,指绕自身的中心轴转动,有时也可特指地球的自转;[D]spiraling“盘旋上升(或下降)”。因此,这三项都不符合题意。
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