Which of the following best explains why electrometallurgy is a useful process in many industries? Electrometallurgy can etch permanent marks and designs into the surfaces of metal products.
Electrometallurgy can create a thin film around metals, preventing rusting and other forms of corrosion.
Electrometallurgy can refine a wide range of impure metals used in manufacturing, wiring, and many other applications.
Electrometallurgy can split water molecules into a cheap source of oxygen gas that can be carried into space and beneath the ocean.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

your mom.com . : 0000

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.