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B. why the atomic radius of potassium is greater than the radius of sodium and of bromine?
Accepted Answer
The atomic radius of potassium is greater than the radius of sodium and of bromine because the atomic number of potassium is greater than that of sodium and bromine. The atomic number is the number of protons in the nucleus of an atom, and the number of protons determines the number of electrons in the atom. The more electrons an atom has, the larger the atomic radius. In the case of potassium, sodium, and bromine, potassium has 19 protons and 19 electrons, sodium has 11 protons and 11 electrons, and bromine has 35 protons and 35 electrons. Therefore, potassium has the largest atomic radius, followed by sodium, and then bromine.
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