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The atomic symbols of some elements are given below:

Ca, Pt, Zr, Ti, Cr, Au, Mo, Mn, Co, Rh, Pd, Si, Cd, Ge, Br, Zn . Which of the elements from the list belongs to period 4?

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Important Questions on Classification of Elements and Periodicity in Properties

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
In which of the following options, the law of triad is applicable?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
Mendeleev's periodic law states that the properties of elements are a periodic function of their
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
Which one of the following statements for D.I. Mendeleev, is incorrect ?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table

Identify the incorrect match.

Name IUPAC Official Name
(a) Unnilunium (i) Mendelevium
(b) Unniltrium (ii) Lawrencium
(c) Unnilhexium (iii) Seaborgium
(d) Unununium (iv) Darmstadtium
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table

It is observed that characteristic X-ray spectra of elements show regularity. When frequency to the power 'n' i.e. vn of X-rays emitted is plotted against atomic number Z, the following graph is obtained.

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The value of 'n' is

 

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The atomic number of the element unnilennium is :
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The element Z=114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table

Match List - I with List - II

LIST-I
(Atomic number)		 LIST-II
(Block of periodic
table)
(A) 37 I. p-block
(B) 78 II. d-block
(C) 52 III. f-block
(D) 65 IV. s-block

Choose the correct answer from the options given below:

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The pair of lanthanides with exceptionally high 3rd ionisation enthalpy than neighbouring elements:
MEDIUM
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
Which of the given atoms has the greatest electron affinity?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The electronic configurations of bivalent europium and trivalent cerium are:
(atomic number: Xe=54 , Ce=58 , Eu=63)
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The neutral oxide among the following is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
Which of the following is a metalloid?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The 71st electron of an element X with an atomic number of 71 enters the orbital:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
For the following Assertion and Reason, the correct option is:
Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason: The reactants are most strongly adsorbed on group 7-9 elements.
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The IUPAC symbol for the element with atomic number 119 would be:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is
Given v= Frequency of X-ray emitted
         Z= Atomic number
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The last element of the p- block in 6th period is represented by the outermost electronic configuration:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Brief History of the Development of Periodic Table
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Atomic no. 65) are: