Colton has an ice cube that has a mass of 4 grams. he places it in a sealed container and then puts it in the microwave on high. the ice cube melts after a few seconds. he removes the sealed container with the melted ice cube and checks the mass again. which sentence best describes what colton discovers? a) the mass of the melted ice cube was less than 4 grams. b) the mass of the melted ice cube was more than 4 grams. c) the mass of the melted ice cube could not be determined. d) the mass of the melted ice cube remained the same at 4 grams.

I believe the answer is D.

The reason is because mass cannot be destroyed. All the mass can really do is become more of less dense.  

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.  

that tool would be a compass