Given the equation representing a reaction at equilibrium:
n2(g) + 3h2(g)==> 2nh3(g) + energy
which change causes the equilibrium to shift to the right?
(1) decreasing the concentration of h2(g)
(2) decreasing the pressure
(3) increasing the concentration of n2(g)
(4) increasing the temperature

it is important to conserve water because there is very limited amount of freshwater here on earth and if we are not smart about how we use it we will only be runnning out of our supply faster than neccessarry.

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.