Classification of Elements in Modern Periodic Table - Meaning, Importance, FAQs

The periodic table commonly called as periodic table of elements is representation of chemical elements in increasing order atomic number of elements, chemical properties, as well as order of their electronic configuration. The table comprises of 118 total elements. It is made up of 7 rows referred to as periods as well as 18 columns referred to as groups.

Modern Periodic Table

Periodic properties of elements are determined by periodic functions of atomic numbers, according to current periodic law.

Across each row, elements were arranged from left to right in increasing order of their atomic numbers. There is a regular pattern in elements with similar properties.

Also check-

• NCERT Exemplar Class 11th Chemistry Solutions
• NCERT Exemplar Class 12th Chemistry Solutions
• NCERT Exemplar Solutions for All Subjects

What is the need for classification of elements?

As new elements were discovered, this becomes important to schedule as well as classify all existing elements. Physical as well as chemical properties, as well as atomic mass, were examined, therefore. Various researchers tried to describe elements based on chemical as well as physical characteristics.

How are elements classified in the modern periodic table classification?

Periodic classification of elements class 11 is a method for classifying elements based on their features, in which we keep elements that are similar in one group and the rest of the elements in the other. Several empty spots have been left in the periodic table classification to put elements that will be discovered in the future without interrupting the elements' trending periodicity.

The current periodic table classification has been divided into seven periods (also known as horizontal rows) and eighteen groups (also known as vertical columns). The elements are grouped ascendingly according to their atomic numbers and the way electrons fill their atomic energy sublevels, according to the build-up hypothesis, with each element having one more electron than the one next to it.

The classification of elements in periodic table in the contemporary periodic table classification has been done in such a way that the majority of the elements are metals. These metals are found on the periodic table classification's left side. Non-metals are a group of elements in the table that number less than 20 and are found on the right side of the table. Some of the elements that occur on the boundary between metals and non-metals are known as metalloids. Metal and nonmetal identical properties are shown by these groups. Most of these elements are solids; just 11 of them, noble gases, oxygen, nitrogen, fluorine, chlorine, and hydrogen, exist as gases, and two of them, mercury and bromine, are liquids.

Also read :

• NCERT notes Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties
• NCERT solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties
• NCERT Exemplar Class 11 Chemistry Solutions Chapter 3 Classification of Elements and Periodicity in Properties

Classification of elements into periods in the periodic table

The periodic table's horizontal row is called a period. The periodic table is divided into seven periods, each starting on the far left. When a new primary energy level begins to fill with electrons, a new period begins. Period 1 only includes two elements (hydrogen and helium), but periods 2 and 3 each have eight. There are 18 elements in Periods 4 and 5.

Because the two bottom rows that are isolated from the rest of the table pertain to those periods, they have 32 elements. They're pulled out to make the table itself fit on a single page more readily.

Classification of elements into groups in the periodic table

Modern periodic tables have vertical columns called groups. In periodic table, there are 18 groups. one through eighteen groups is numbered. The elements in each group have same outer shell electronic configuration.

Based on organization of the outer shell electrons, a group is a vertical column of the periodic table. There are 18 groupings in all. You should be familiar with both of the numerical schemes that are typically used to designate groups. The letters A and B are employed in the conventional system in the United States. 1A and 2A are the first two groups, while 3A through 8A are the last six. The name of the middle group is observed to begin with B. In Europe, however, there was a slightly different structure in place. To avoid confusion, the International Union of Pure and Applied Chemistry (IUPAC) agreed on a simple 1 through 18 method from left to right as the official system for numbering groups.

NCERT Chemistry Notes :

• NCERT notes Class 11 Chemistry
• NCERT notes Class 12 Chemistry
• NCERT Notes For All Subjects

Points to Remember :

Periods (rows) and groups (columns) make up the modern Periodic Table (columns). There are 18 groups, each with a different number of periods ranging from one to seven.

• The energy level or orbit number is represented by a period.

• There are only two elements in the first period. This is the shortest time frame.

• Each of the second and third periods has eight elements. Small periods are what they're called.

• Each of the fourth and fifth periods has 18 elements. These are referred to as extended periods.

• Each of the sixth and seventh periods has 32 elements. These are referred to as "very long times."

• The number of valence electrons in an element is equal to its group number.

• Metals are accommodated on the left end while nonmetals are accommodated on the right end of the table.

• Noble elements are found in the periodic table's last group.

Also read -

• NCERT Solutions for Class 11 Chemistry
• NCERT Solutions for Class 12 Chemistry
• NCERT Solutions for All Subjects