If the concentration of substance A of a reversible reaction in dynamic equilibrium decreases, how will the equilibrium change? A. It will shift to create more of substance A.
B. It will not change.
C. It will shift towards the products.
D. It will shift to create less of substance A.
please, do not delete your answers

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 believe the answer is three water molecules