Bisphenol a (bpa) is an aromatic compound that has been used in resins found in baby bottles and children's cups. what is the structure of bpa and why have concerns been raised about its presence in baby products? what other products contain resins made with bpa? what is the current status of fda regulations on the use of bpa in consumer products? what alternatives are now used in place of bpa in baby products? be as specific as possible, and include chemical structures when they are known.

what are the choices?

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.  

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.