EASY
Earn 100

Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) were placed in group 17 of the Periodic Table. The name of this family is .

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Important Questions on Periodic Classification of Elements

MEDIUM
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The only element among non-metal that exists in the liquid state at room temperature is :
HARD
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Five elements A, B, C, D and E have atomic numbers of 2,3,7,10 and 18 respectively. The elements which belong to the same period of the periodic table are:
MEDIUM
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Define the term atomic size.
EASY
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:
MEDIUM
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.

EASY
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.

 

EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
State modern periodic law.
MEDIUM
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)
EASY
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 ?
EASY
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:
EASY
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:
HARD
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
What would be the IUPAC name for the element with the atomic number 120?
EASY
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?
MEDIUM
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
In the modern periodic table which are the metals among the first ten elements?
EASY
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.
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Scandium is a transition element. But zinc is not. Why?
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Decrease in ionic size in a period is observed in
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The elements with atomic numbers 101 and 104 belong to, respectively:
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The IUPAC symbol for the element with atomic number 119 would be:
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Who developed the long form of periodic table ?