Which of the following is a true statement?
group of answer choices

all reversible reactions are at equilibrium.

all equilibrium reactions are exothermic.

all exothermic reactions are at equilibrium.

all equilibrium reactions are reversible.

answer:

the third one is true and rest are false : ) have a nice day! and stay ugly

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.  

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