✔ 最佳答案
Draw elecron diagram of C2H6 showing electrons in the outermost shells only :
Draw two circles of C horizontally. In each circle, draw the 4 electrons (x) at positions of top, bottom, left and right. These two circles overlap each other with 2 electrons (xx, single bond).
There are 3 electrons left in each circle of C. In other words, totally 6.
Then draw 6 circles of H, and in each circle draw one electron (•). Each circle of H overlaps with a circle of C with 2 electrons (x•, single bond).