Question

which of the following do lewis structures help us understand? the exact structure of a molecule the number of electrons that are involved in the bonding of the molecule the total number of electrons in a molecule how electrons attract other electrons in a molecule

Explanation:

Lewis结构（路易斯结构）主要用于表示分子中原子的成键情况，能直观地看出参与成键的电子数。它不能表示分子的精确三维结构（因为它是二维的表示方式），也不能表示分子中电子的总数（只是成键和孤对电子等部分电子情况），电子之间主要是相互排斥（同性相斥）而不是吸引。

Answer:

the number of electrons that are involved in the bonding of the molecule