We’re being asked to rank the given set of elements in order of decreasing atomic radius.
Atomic radius represents the distance from the nucleus to the outer shell of an element.
The trend of the atomic radius in the periodic table:
• decreases going from left to right of a period
• increases going down a group
Of the following, which gives the correct order for the atomic radius for Ca, K, As, Ge and Kr?
A) Ca > K > As > Ge > Kr
B) Kr > Ge > As > K > Ca
C) Ge > As > Kr > K > Ca
D) K > Ca > Ge > As > Kr
E) Kr > As > Ge > Ca > K
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What scientific concept do you need to know in order to solve this problem?
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