Which of the following statements correctly describe the surface tension of a liquid? a. Surface tension is the amount of energy released when a liquid forms spherical droplets.
b. A polar liquid will have a higher surface tension than a nonpolar liquid.
c. Surface tension is the amount of energy required to increase the surface area of a liquid by a unit area.
d. A liquid with weak intermolecular forces will have a high surface tension, since molecules can escape from the surface more easily.
e. Surface tension is the result of a net downward and inward force on the surface particles of a liquid.

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.  

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

the right answer is c i just did the question.