Need help but I’m not good in science

the answer is the first option

explanation:

just googled it m8. not that hard

lol

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.  

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

since electrons are negative the answer is neagtaive