Radius of atom decreases from left to right of a period. why?

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because though electrons increase electrons added same shell know.but know along period atomic number increasing refers nuclear charge increases(due more no. of protons) after increase in electrons, size not increase rather decrease because nuclear attraction stronger on electrons of same shell

since no of shells same in period radius should same. or cuz no of electrons increase radius should increase. can u pls explain me why radius decreases


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