Dry ice pellets, the solid form of carbon dioxide, were placed in the bottom of this flask. The flask was then covered with a balloon. Within 15 minutes, there was a change in the flask, as seen here. Explain what happened to the CO2 molecules. Which image BEST provides a visual explanation?

c.

explanation:

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.