Modern Periodic Law
Q1: State Modern Periodic Law.
Answer:
“The physical and chemical properties of the elements are periodic functions of their atomic numbers.”
Q2: What is the difference between Mendeleev’s Periodic Law and Modern Periodic Law?
Answer.
In Mendeleev’s period law atomic mass is considered as base for periodicity property but in modern periodic law atomic number is considered as the base for the periodicity property.
Q3: Who Gave the Modern Periodic Law?
Answer:
Henry Moseley proposed the modern periodic law in 1913.
Q4: Who invented Modern Periodic Table?
Answer:
Neil Bohr invented the Modern Periodic Table using the Modern Periodic Law.
Q5: How many Periods and Groups are in Modern Periodic Table?
Answer:
There are 18 groups and 7 periods in the Modern Periodic Table.
Modern Periodic Law
All matter in our environment is made up of basic units known as elements. Initially, only 31 chemical elements were discovered in 1800 and it was easier to study their chemical and other properties. However, as more and more elements were discovered due to technological advancements in science, it became harder to study all the elements simultaneously. Scientists began to think about a method to simplify the study of elements in order to make their work easier.
It was observed that elements’ properties have periodicity, and to study the properties of elements in a fixed pattern, many tables were created to arrange the elements in an ordered manner based on their characteristics. Some examples of these are Doberiener’s triads, Newland’s octaves, Mendeleev’s periodic table, etc.
Significance of the Periodic Classification of Elements
- The classification of elements into groups provides us with a fixed pattern in which the elements’ properties change on a regular basis. The periodic table simplified and organized the study of elements’ physical and chemical properties. We can now simply go to the group and see the properties of the periodic table elements or predict the properties of an element if we know the properties of other elements in the same group.
- Despite the fact that so many elements have already been discovered, there is still a chance that new elements will be discovered. Scientists can use a periodic table to learn about the trending characteristics of elements based on their properties, and thus distinguish new elements from existing ones. Furthermore, researchers are constantly striving to discover new elements and investigate their properties.