如果是原子质量一定，而电子很小，那么带正电荷的部分几乎占据了全部质量。
If the atom is fixed mass, and the electron is tiny, it must be the positives have all the mass.
原子中的电子数,将近是原子质量的一般。
The number of electrons in an atom is deduced to be approximately equal to half the atomic weight.
如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。
If the atom is fixed mass, the electron is tiny, it must be the positives have all the mass.
由于质子与中子的质量大约相等(并且电子几乎没有质量)，氦原子的质量大约应是氢原子质量的四倍。
Because protons and neutrons have roughly the same mass (and electrons have almost no mass), the helium atom should have about four times the mass of the hydrogen atom.
我的意思是，原子的质量也很小，但是我们说的是，和整个原子质量相比，电子的质量是很小的。
I mean, the atom has a tiny mass, too, but what we are saying is compared to the totaled atomic mass, the mass of the electron is tiny.
电子的质量是氢原子质量的1850分之一。
电子的质量是氢原子质量的1850分之一。
应用推荐