Question

a lithium atom has three protons, three neutrons, and three electrons. what is the overall charge on this atom? -3 0 +1 +3

Explanation:

Step1: 确定质子、电子电荷

质子带1个单位正电荷，电子带1个单位负电荷，中子不带电。

Step2: 计算电荷总数

3个质子电荷数为$+3$，3个电子电荷数为$-3$，$+3+( - 3)=0$。

Answer:

B. 0