Which of these four elements has the most neutrons?
To solve this, we will look at the atomic number and mass of each element. The atomic number tells us how many protons there are, and mass is protons and neutrons combined. So to find the number of neutrons, simply take the mass and subtract it by the atomic number.
1. 79-34=45 neutrons
2. 80-35=45 neutrons
3. 73-32=41 neutrons
4. 84-36=48 neutrons
The answer is choice 4, Krypton (Kr).
Hope this helped!