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:A fruit with many seeds that has many joined carpels…What is the mass number of an element having 20…Even though some flowering plants contain accessory…Which of the following species does not contain a…A cheque does not contain?