An element with Z = 25 belongs to…….block….group and ……period of modern periodic table
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 Hint
7)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;