Which is an overall second-order reaction?
r=k[a]2 [b]2
r=k[a][b]
r=k
r=k[b]

the product of the pressure and volume is also constant

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 answers would be

the first one and the second one

you gotta add the following molecules so we can give u an answer

explanation: