In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending uponthe type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s,p,d, and f. the modern periodic table consists of 7 periods and 18 groups. each period begins with the filling of a new energy shell. in accordance with the aufbau principle, the seven periods (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. the seventh period is still incomplete. to avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the maini body of the periodic table. Q. Which of the elements whose atomic numbers are given are given below, cannot be accomodated in the present set up of the long form of the periodic table?

In the modern periodic table, elements are arranged in order of increa

1.	In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending uponthe type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s,p,d, and f. the modern periodic table consists of 7 periods and 18 groups. each period begins with the filling of a new energy shell. in accordance with the aufbau principle, the seven periods (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. the seventh period is still incomplete. to avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the maini body of the periodic table. Q. Which of the elements whose atomic numbers are given are given below, cannot be accomodated in the present set up of the long form of the periodic table?
Answer» 107 118 126 102 Solution :In PRESENT set up of long form of PERIODIC table element with ATOMIC number>118 can not be accomodated.