The first one will be above and below the bond axis is where we'll see the electron density, and the second will be perpendicular to that, so it will be a density in front of and behind the bond axis.
第一个是在键轴之上和之下，我们可以看到电子密度，另外一个垂直于它，所以在键轴之前和之后有电子密度。
2
A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion.
一个原子失掉一个电子来形成一个正离子，另一个原子得到一个电子来形成一个负离子的化学键。
3
An ionic bond is characterized by the transfer of an electron from one atom to the other.