QUESTION 25 Why does atomic radius tend to decrease as one moves from left to ri

Question

QUESTION 25 Why does atomic radius tend to decrease as one moves from left to right across the periodic table for elements in the same period? O Because the number of electrons increases as one move left to right across a period. O Because the effective nuclear charge felt by the outermost electron increases as one moves left to right within a period. O Because the number of filled shells increases as one moves left to right across a period. O Because the electronegativity decreases as one moves left to right across a period.

Explanation / Answer

Atomic size gradually decreases from left to right across a period of element this is because when we go from left to right electrons are added to the shell, however protons are also added,but the affect of increasing the proton number is greater than if electron Number, or we can say that the effective nuclear charge is increased , so the atomic radius is decreased.

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