Why do atomic radi decrease from left to right across a period of the periodic t

Question

Why do atomic radi decrease from left to right across a period of the periodic table? Atomic radili decrease from left to right across a period because the total number of electrons on the electron shell decreases Atomic radi decrease from left to right across a period because the effective nuclear charge decreases. Atomic radii decrease from left to right across a period because the effective nuclear charge increases. Atomic radi decrease from left to right across a period because the total number of electrons on the electron shell increases Higure -215 pm r- 114 pm -197 pm Which of the following three spheres (Figure 1) represents a Ca atom, which an Sr atom, and which a Br atom? Sr (215 pp)> Ca (197 pp)> Br (114 ppm) Sr (215 ppm) >Br (197 ppm) > Ca (114 ppm) O Ca (215 pp) >Sr (197 ppm)>Br (114 ppm) O Ca(215 ppm) >Br (197 ppm) > Sr (114 ppm)

Explanation / Answer

Atomic Radii decreases from left to right across the period because of the effective nuclear charge increases

Atomic radii decrease, however, as one moves from left to right, across the Periodic Table. Although more electrons are being added to atoms, they are at similar distances to the nucleus; and the increasing nuclear charge "pulls" the electron clouds inwards, making the atomic radii smaller.

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