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:How many carbon atoms does the parent chain contain?Even though some flowering plants contain accessory…A cheque does not contain?An isotope has an atomic number of 15 and a mass…What is the mass number of an element having 20…