what isn smallest atomic size
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Explanation:
Helium (atomic number 2) has the smallest atomic size. ... The atomic radius of an element reduces when there is an increase in atomic number. It is because the attraction between the shell and the nucleus increases due to the increase in electrons in a shell.
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Answer:
Helium and Hydrogen is the smallest atom
Explanation:
Size : 30 picometres
Helium : 2 protons 2 neutrons 2 electrons
Hydrogen : 1 proton 0 neutrons 1 electron
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