it is said that in the valence shell of lithium one proton is pulling one electron and in berilium two protons are pulling two electrons. but the atomic radius of lithium is bigger than berilium.if the amount of attraction according to their valency will be equal. then why?
Atom A has a mass number 209 and atomic number 82.
Atom B has a mass number 209 and atomic number 83.
(i) How many protons atom A has ?
(ii) How many protons atom B has ?
(iii) Are atoms A and B isotopes of the same element ?