You are trapped inside a submarine that is going to self destruct in 30 minutes. You then find 3 objects that inject some sort of Gas. They are all labeled, 2 of them are lethal, and one of them is a breathing gas. Which Breath Injection would you use to get back up to the surface? (A) = Hydrogen Sulfide

(B) = Arsine

(C) = Hydrox

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.  

elements make up everything, and they combine to make compounds.

the answer is c