1. Find at 3 places in Recycle City where books are resold or reused. 2. Harlin Hazzard of the Recycle City Hazardous Waste Center wants to hire you as his assistant manager. Before you can accept, you must name the 4 characteristics that make hazardous waste hazardous.

3. You've been hired to build a landfill for a neighboring community. Use Recycle City's landfill to help you. What are the 5 layers that a landfill needs to be safe?

h let me think

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.