An element with Z = 11  belongs to ………….period of modern periodic table

detailed solution

Correct option is B

Hints to predict the position of element in the Modern periodic table :1)Elements from Z = 58-71……Lanthanoids…..4f series….6th period……3rd(IIIB) group;2)Elements from Z = 90-103……Actinoids…..5f series….7th period……3rd(IIIB) group;3)Elements from Z = 104-118………..Last two digits gives group number….. 7th period;4)Elements from Z = 31-57….subtract 18 to get preceding element;5)Elements from Z = 72-89….subtract 32 to get preceding element;6)Elements from Z = 104-120….subtract 32 to get preceding element ;For Z=104-120….simplest Hint7)Elements from Z = 104-120….subtract 82 to get a lower member(Z<30) belonging to same group;Hints 4, 5 and 6 can be used repeatedly until an element belonging to same group with Z < 30 is obtained;Elements with Z < 30 with their group, period and block can be known from Electronic configuration;Ex : Z=119, 87, 55, 37, 19, 11….belong to 1st(IA) group;(119-32)=87; (87-32)=55; (55-18)=37; (37-18)=19;(19-8)=11;Z = 11…..Na….3s1…..n=3….3rd period……s-block….valence electrons(1)….1st group;Z = 19…..K….4s1…..n=4….4th period……s-block….valence electrons(1)….1st group;Z = 37…..Rb….5s1…..n=5….5th period……s-block….valence electrons(1)….1st group;Z = 55…..Cs….6s1…..n=6….6th period……s-block….valence electrons(1)….1st group;Z = 87…..Fr….7s1…..n=7….7th period……s-block….valence electrons(1)….1st group;Z = 119…..Uue….8s1…..n=8….8th period……s-block….valence electrons(1)….1st group;