Now balance the chemical reaction by providing the correct coefficients:
aluminum + chlorine gas yields
aluminum trichloride
[?]AL+[?]CCl2 → [?]AICI3

2AL + 3CL2 ->2ALCL3

Explanation:

I hope this helps

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.  

the correct answer would be b) volume versus temperature, because they are also directly proportional.