How many protons does 40//20Ca contain? by Sunday | May 9 | Chemistry WAEC | 0 comments A. 20 B. 30 C. 40 D. 60 Correct Answer: Option A A. 20 Users Also Read These:Which of the following feedstuffs does not contain…Which of the following species does not contain a…Which of the following alloys does not contain copper?What is the mass number of an element having 20…A metallic ion Z2+ with an inert gas structure…