Question

Rank the following elements from largest to smallest atomic radius Ne > Cl > Ca >...

Rank the following elements from largest to smallest atomic radius

Ne > Cl > Ca > K

Ca > K > Cl > Ne

K > Ca > Cl >Ne

K > Cl > Ca >Ne

Ne > Ca > Cl > K
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Answer #1

K>Ca>Cl>Ne

atomic radius - Ne-38pm

-Cl-175pm

-Ca-231pm

-K-280pm

Atomic size gradually decreases from left to right across a period of elements. The reason being, within a period , all electrons are added to the same shell. At the same time, protons are being added to the nucleus, making it more positively charged. The effect of increasing positive charge number is greater than that of the increasing negative charge number; therefore, there is a greater nuclear attraction. This means that the nucleus attracts the electrons more strongly, pulling the atom's shell closer to the nucleus. The valence electrons are held closer towards the nucleus of the atom that is also called shielding effect. Thus the atomic radius decreases.

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