Periodic Classification of Periodic Table

Periodic Classification of Compounds and Trends


Important questions

Que 1
How many elements are known to us

Ans
118 elements are known to us and which 94 are naturally occurring

Que 2
What is Dobereiner's Traids

Ans
In 1817 scientist Dobereiner arrange the elements with similar properties into group
Identify some groups having three elements each so he called his group Traida

According to him
when three elements in a traid were written in order of increasing atomic masses atomic mass of the middle element was the average of atomic masses of other two elements

Que 3
What is Newland law of octaves

Ans
In 1866 John newland arrange the known elements in the order of increasing atomic
masses

He found that every eighth element has the similar properties to that of the first
He compare this to the octaves found in music therefore he called it the law of octaves


Que 4
How many elements were known at the time of mendeleev classification of periodic table

Ans
64

Que 5
What is the periodic law for mendeleev periodic table

Ans
"The properties of elements are the periodic function of their atomic masses "is the periodic law for the mendeleev periodic table

Que 6
What is the name given to the vertical columns and horizontal rows in the periodic table

Ans
The vertical columns are called groups
Horizontal rows are called periods


Que 7
What are the limitations of mendeleev periodic table classification

Ans
The position of the hydrogen cannot be fixed as hydrogen has both the properties of alkali and the halogens

There is no place for the isotopes of the element

Que 8
What is the basis of Mendeleev periodic table

Ans
Mendeleev arrange the elements in order of their increasing atomic masses

Que 9
Who discovered atomic number

Ans
In 1913 Henry Moseley

Que 10
What is the basis of modern periodic table

Ans
The modern periodic table is arranged on the basis of the atomic number

Que 11
What is modern periodic law

Ans
Properties of elements are a periodic function of their atomic number


Que 12
How many vertical columns and horizontal rows are found in modern periodic table

Ans
There are 18 vertical columns known as groups

There are 7 horizontal rows known as periods


Sat Dec 3, 2022


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