Why exact atomic radius easement is not possible?​

As there are no physical existence of orbital in atoms, it is difficult to measure the atomic radius. Thus sometime different methods are used to measure the radius while they are bonded in a molecule. According to the Heisenberg uncertainty principle, it is not possible to measure the momentum and the position of the electron simultaneously.

Explanation:

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.