Predicting position of element in modern periodic table
Question

# An element with Z = 25  belongs to……block of modern periodic table

Moderate
Solution

## 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=107, 75, 43, 25….belong to 7th(VIIB) group;(107-32)=75; (75-32)=43; (43-18)=25;(n-1)d1-10ns1-2 ;Note : Many elements of d-block have anomalous configuration. So only GEC of each group is highlighted;Z = 25…….Mn…  4s23d5……n=4…..4th period…..d-block….…..7th group;Z = 43…….Tc………….….….n=5….5th period……d-block……...7th group;Z = 75…….Re…………..……n=6….6th period…….d-block…..…7th group;Z = 107…..Bh…………..……n=7…..7th period……d-block..……7th group;

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