You have just gotten a new job as city planner. Your first task is to review the plan for a new city. The city will be next to the foothills of mountains with a river running through the middle of it. Review the provided image of the city plan and identify three or more environmental problems with their plan. Provide at least three solutions to your identified issues.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

c) should be the answer.