What property of oil makes it float on water?

Oil being less dense than water floats on it. Had it been denser than water like iron, it would have sunk. Density is mass per unit volume. It means that if you take a cubic cm (cc) of oil, its mass is much lesser than a cubic cm of water.

Hope this helped

Good luck

Brainliest is appreciated

~ Emmy

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

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.