Question

Modern extended periodic table was given by:
A.Bohr
B.Lother Meyer
C.Mosley
D.None of the above

Answer 1

Periodic table is the arrangement of all the known elements according to their properties in such a way that the elements of similar properties are grouped together in a tabular form.

Complete answer:
Various scientists gave various forms to design periodic table, some of them are given below:
According to Lavoisier classification, elements can be classified simply in metals and non metals. Metals are the one which have the tendency of losing the electrons and nonmetals have the tendency of gaining the electrons.
According to Newland octet rule, elements can be arranged in atomic mass as if elements are arranged in increasing order of atomic mass their properties of every eighth element was similar to the first element of the octet. For example properties of lithium are similar to eighth element sodium.
Lother’s Meyer curve was between atomic weight and atomic volume. This curve proposed that the physical properties of the elements are periodic functions of their atomic weight as elements having similar properties occupy a similar position on the curve.
According to Mendeleef’s periodic table, physical and chemical properties of elements are the periodic function of their atomic weight. It arranged the known elements at that time in a systematic manner that is in horizontal rows and vertical columns. It also gave encouragement to the discovery of new elements as some gaps were left in it.
Modern periodic table or modified Mendeleef’s periodic table was proposed by Moseley. It is based on atomic number. It states that physical and chemical properties of the elements are periodic functions of their atomic number.
Long form or extended form of periodic table based in the Bohr Bury electronic configuration concept and atomic number. It was proposed by Rand and Werner. This table consists of 7 periods and 18 groups.

Thus, the correct option is D.
Note:
According to Proust’s hypothesis, all the elements are made up of hydrogen, so it can be given as: ${\text{atomic weight of element}} = {\text{n}} \times \left( {{\text{atomic weight of one hydrogen atom}}} \right)$ where n is a even number.
According to the Dobereiner trial rule, the atomic weight of the middle element is nearly equal to the average atomic weight of the first and third element in a triad. For example:

Element	Cl	Br	I
Atomic weight	$35.5$	$80$	$127$

As ${\text{x}} = \dfrac{{35.5 + 127}}{2} = 81.2 \approx 80$ .