Question

Arrange the elements given in order from largest to smallest atomic radii. 

Answer 1

Ans: the trend of the atomic radius is it increases down the in groups and decreases from left to right

K=>Group 1,period 4

Na=>Group 1,period 3

P=>Group 15,period 3

Ar=>Group 18,period 3

Ne=>Group 18,period 2

K is located at the lowest period in the first group and hence it has the highest atomic radius

Ne is located in the 2nd period of the last group(rightmost) hence it has the lowest atomic radius

Na, P, and Ar are in the same period (3rd) and Na is at rightmost(1st group) hence have the highest atomic radius among three P is in 15th group hence has Radius greater than Ar and lower than Na ......and these three elements have atomic radius lower than K and higher than Ne

hence order can be written as K>Na>P>Ar>Ne hence last option is the correct Ans