what is the difference between a mixture and compound?
a. a mixture is a liquid and a compound is a solid.
b. a mixture is made of two or more elements and a compound is made of just one element.
c. a compound is made of two or more different types of molecules, and a mixture is made of just one type of molecule.
d. a mixture is made of two or more different types of molecules, and a compound is made of just one type of molecule.

Compound: a thing that is composed of two or more separate elements, basically it is a mixture

Mixture: a substance made by mixing other substances together

so go from there. I don't want to cheat by giving answers, so I hope this is guiding and helpful. please mark brainliest if it is!

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