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The Modern Periodic Law states that the properties of elements are a periodic function of their atomic  .

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Important Questions on Periodic Classification of Elements

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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The 71st electron of an element X with an atomic number of 71 enters the orbital:
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Which among the following elements is a metalloid?
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Atomic no. 65) are:
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The electronic configurations of bivalent europium and trivalent cerium are:
(atomic number: Xe=54 , Ce=58 , Eu=63)
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table

Consider the following radioactive decays

I. U92⟶-α90Th and

II. 90Th⟶-αRa88

In which case group of parent and daughter elements remains unchanged.

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Science>Chemistry>Periodic Classification of Elements>The Modern 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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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table

The outermost subshell electronic configuration of an element is 3d5 4s2.

Write the atomic number of the element.

 

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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Scandium is a transition element. But zinc is not. Why?
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
What will be the IUPAC symbol and name for the element with atomic number 123 ?
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The last element of the p- block in 6th period is represented by the outermost electronic configuration:
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table

The correct match among the following is

(a) Lithium, Sodium, Potassium            (i) Alkaline earth metals
(b) Beryllium, Magnesium, Calcium      (ii) Semi-metals
(c) Oxygen, Sulphur, Selenium             (iii) Alkali metaIs
(d) Silicon, Germanium, Arsenic           (iv) Chalcogens

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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
What would be the IUPAC name for the element with the atomic number 120?
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The set that contains atomic numbers of only transition elements, is :
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Science>Chemistry>Periodic Classification of Elements>The Modern 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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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Which of the following does not exist?
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
To which group of the periodic table does an element having electronic configuration [Ar]3d54 s2 belong?
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
An element of atomic number 118 would be a/an __________
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Decrease in ionic size in a period is observed in
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The elements with atomic numbers 101 and 104 belong to, respectively:
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The IUPAC symbol for the element with atomic number 119 would be: