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The picture shows an incomplete periodic table.

Arrow 1 and arrow 2 indicate increase or decrease in chemical properties.

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Important Questions on Periodic Classification of Elements

EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
State modern periodic law.
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
In the modern periodic table which are the metals among the first ten 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 :
MEDIUM
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Define the term atomic size.
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:
HARD
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Elements of 2nd period are known as _____. (typical elements / bridge elements)
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
In the modern periodic table, elements have been arranged in the order of increasing _____.
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Elements of third period are known as _____. (bridge elements / typical elements)
HARD
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The general electronic configuration of transition elements is (n-1)d1-ans1-2. The value of a will be _____. (6, 7, 10)
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
_____ are placed in the same slot in the Modern Periodic Table. (Isobars / Isotopes)
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The first period contains _____ elements.
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table

Moseley classified elements according to their _____. (atomic number/atomic mass)

HARD
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The electropositive nature of elements _____ on going from left to right in a period of the periodic table. (increases/ decreases)
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The valency of elements in group 2 is _____.
MEDIUM
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
_____ has the highest value of atomic volume. (Helium / Francium)
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Horizontal rows of elements in the periodic table are called _____.
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Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The tendency to gain electron _____ on going from top to bottom in a group of the periodic table.                                                    (increases/ decreases)
EASY
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The elements of group 17 are known as _____.
HARD
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
Elements forming oxides with same type of formula will have _____ chemical properties. (same / different)
MEDIUM
Science>Chemistry>Periodic Classification of Elements>The Modern Periodic Table
The number of _____ determines which element will be the first and which the last in a period of the periodic table.(valence electrons/outer orbitals)