Question

Atomic number of last elements of d block and p block of incomplete periods assuming that the period is completed.
A.$111,86$
B.$80,86$
C.$112,118$
D.$111,117$

Answer 1

Hint: To answer this question, you must recall the positions of elements in the periodic table and the manner in which the elements are arranged. D-block corresponds to the filling of 10 electrons in the d orbital of an atom while p block corresponds to the filling of 6 electrons in the p orbital of an atom

Complete step by step answer:
The periodic table can be used to derive relationships between various physical and chemical properties and behaviours of elements. The modern periodic table provides an essential framework that helps in the assumption of the characteristics and properties of the elements yet to be discovered.
The last elements lie in the period seven of the periodic table. Both the period 6 and period 7 have 32 elements each, 2 in s-block, 10 in d-block, 14 in f-block and 6 in p-block.
The last element of the d block must come below mercury. We know that the atomic number of mercury is 80. Thus the element should have atomic number $ = 80 + 32 = 112$.
There are 6 elements in p-block, thus, the last element of p-block should have atomic number $ = 112 + 6 = 118$.

Note:
 Atoms of each element contain a fixed number of protons. Rather, we can say that the number of protons determines the atom we are considering. We are familiar with the fact that the number of protons in an atom is called the atomic number of the atom. Unlike the number of protons, the number of neutrons for a certain element can vary. Atoms of the same element that differ only in the number of neutrons in their nucleus are called isotopes. Together, the number of protons and the number of neutrons determine the atomic mass of the element.