Answer:A B
How many electrons are there in Florine with a -1 charge? 10
What is the total number of nucleons in helium? 4
What is the mass number of an element if it contains 19 protons, 19 electrons, and 20 protons? 39
What is the atomic number of an element with 7 protons, 10 electrons, and 7 neutrons? 7
Explanation: Credit to GOOGLE
