Of the following,which gives the correct order for 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

Question

Of the following,which gives the correct order for 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

Quizplus · Accepted Answer

Atomic radius generally decreases across a period from left to right due to the increase in nuclear charge which pulls the electrons closer to the nucleus. It increases down a group as additional electron shells are added. K (potassium) and Ca (calcium) are in the same period with K being to the left of Ca, making K larger than Ca. Ge (germanium), As (arsenic), and Kr (krypton) are in the same period with increasing nuclear charge from Ge to Kr, making Ge larger than As, and As larger than Kr. Therefore, the correct order is K > Ca > Ge > As > Kr.

Of the Following,which Gives the Correct Order for Atomic Radius