Problem: How does the atomic radius of Ca compare with that of K?(a) Ca is larger because it has more electrons(b) Ca is larger because its effective nuclear charge is greater(c) K is larger because it has fewer electrons(d) K is larger because its effective nuclear charge is less(e) Ca and K are essentially the same size

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Establish the trend for atomic radius and determine which among K and Ca has a larger atomic radius 

Atomic radius represents the distance from the nucleus to the outer shell of an element. 

Trend of atomic radius in the periodic table:

decreases going from left to right of a period

increases going down a group

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Problem Details

How does the atomic radius of Ca compare with that of K?

(a) Ca is larger because it has more electrons

(b) Ca is larger because its effective nuclear charge is greater

(c) K is larger because it has fewer electrons

(d) K is larger because its effective nuclear charge is less

(e) Ca and K are essentially the same size

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