First 20 Elements - Meaning, Definition, Examples, Periodic Table, FAQs

First 20 elements:

Any substance that cannot be broken down chemically into simple molecules is called an element. An element is made up of atoms with the same atomic number, which means that each atom will have the same amount of protons in the nucleus like the other atoms in the component.

First 20 elements Of The Periodic Table

The periodic table is the representation of elements in the increasing order of their atomic number.

The first twenty elements in the periodic table ranging from atomic numbers 1-20 is

Also read -

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

The atomic number of the first twenty elements is given in 1^st column while the symbol of the first 20 elements name is given in the last column.

An in-depth of the first 20 elements in the periodic table is useful. Six of these elements make up nearly all of the mass of the human body. The first 20 elements provide an excellent overview of the various element groups. They can also be found in more common chemical processes. The elements are given in ascending atomic number 1 to 20 order. The atomic number refers to the number of protons in each element's atoms.

Name and Symbols of Elements:

The atomic number, element name, or element symbol can all be used to identify elements. A one- or two-letter abbreviation of the name serves as the emblem. Some symbols, on the other hand, allude to old element names. The symbol for sodium, for given as Na. This is a reference to the Latin word natrium, which was once used to refer to caustic soda. In latin, name of atomic no of sodium is found to be natrium. Potassium's symbol is K, which is derived from the Latin word kalium, which denoted alkali or potash. An element symbol's initial letter is capitalised. It's lower case when there's a second letter.

Examination of 1 to 20 elements of periodic table:

1. Hydrogen

Under normal circumstances, hydrogen is a nonmetallic, colourless gas. It transforms into an alkali metal under great pressure. This element has three isotopes, each with a different amount of neutrons in its atoms. Protium is the most prevalent isotope. Deuterium and tritium are the other two.

1. atomic number of Hydrogen is 1

2. H is its symbol

3. It is estimatied to have an atomic mass value of 1.008 amu

4. H is assigned 1s¹ configuration

5. It is a Nonmetal belonging to group 1 and s-block

2. Helium

1. Helim is a light gas with no visible colour.

2. atomic number of Helium is 2

3. He is its symbol

4. It is estimatied to have an atomic mass value of 4.002 amu

5. He is assigned 1s² configuration

6. It is belonging to group 18 and s-block

3. Lithium

It is a highly reactive solid metal with silver colour

1. atomic number of Lithium is 3

2. Li is its symbol

3. It is estimatied to have an atomic mass value of 6.94 amu

4. Li is assigned [He] 2s¹ configuration

5. It is an alkali metal belonging to group 1 and s-block.

4. Berilliyium

It is a solid material with a shiny gery- white appearance

1. atomic number of berilliyum is 4

2. Be is its symbol

3. It is estimatied to have an atomic mass value of 9.012 amu

4. Be is assigned [He] 2s² configuration

5. It is an alkaline earth metal belonging to group 2 and s-block.

5. Boron

1. atomic number of Boron is 5

2. B is its symbol

3. It is estimatied to have an atomic mass value of 10.81 amu

4. B is assigned [He] 2s² 2p¹ configuration

5. It is metalloid belonging to group 13 and p-block.

6. Carbon

1. atomic number of carbon is 6

2. C is its symbol

3. It is estimatied to have an atomic mass value of 12.011 amu

4. C is assigned [He] 2s² 2p² configuration

5. It is metalloid belonging to group 14 and p-block

Read more :

• 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

7. Nitrogen

1. atomic number of nitrogen is 7

2. N is its symbol

3. It is estimatied to have an atomic mass value of 14.007 amu

4. N is assigned [He] 2s² 2p³ configuration

5. It is belonging to group 15 and p-block.

8. Oxygen:

1. atomic number of oxygen is 8

2. O is its symbol

3. It is estimatied to have an atomic mass value of 16 amu

4. O is assigned [He] 2s² 2p⁴ configuration

5. It is belonging to group 16 and p-block

9. Fluorine:

1. atomic number of fluorine is 9

2. F is its symbol

3. It is estimatied to have an atomic mass value of 18.989 amu

4. F is assigned [He] 2s² 2p⁵ configuration

5. It is belonging to group 17 and p-block

10. Neon:

1. atomic number of neon is 10

2. Ne is its symbol

3. It is estimatied to have an atomic mass value of 20.179 amu

4. N is assigned [He] 2s² 2p⁶ configuration

5. It is belonging to group 18 and p-block

11. Sodium:

1. atomic number of sodium is 11

2. Na is the symbol of sodium

3. Latin name of sodium is Natrium

4. It is estimatied to have an atomic mass value of 22.989 amu

5. F is assigned [Ne] 3s¹ configuration

6. It is belonging to group 1 and s-block

12. Magnesium:

1. atomic number of magnesium is 12

2. Mg is its symbol

3. It is estimatied to have an atomic mass value of 24.309 amu

4. Mg is assigned [Ne] 3s² configuration

5. It is belonging to group 2 and s-block

13. Aluminium:

1. atomic number of aluminium is 13

2. Al is its symbol

3. It is estimatied to have an atomic mass value of 26.968 amu

4. Al is assigned [Ne] 3s² 3p¹ configuration

5. It is belonging to group 13 and p-block

14. Silicon

1. atomic number of Silicon is 14

2. Si is its symbol

3. It is estimatied to have an atomic mass value of 28.085 amu

4. Si is assigned [Ne] 3s² 3p² configuration

5. It is belonging to group 14 and p-block.

15. Phosphorous:

1. atomic number of Phosphorous is 15

2. Pis its symbol

3. It is estimatied to have an atomic mass value of 30.9737 amu

4. P is assigned [Ne] 3s² 3p³ configuration

5. It is belonging to group 15 and p-block

16. Sulfer:

1. atomic number of Sulfer is 16

2. S is its symbol

3. It is estimatied to have an atomic mass value of 32.09 amu

4. S is assigned [Ne] 3s² 3p⁴ configuration

5. It is belonging to group 16 and p-block

17. Chlorine

1. atomic number of Chlorine is 17.

2. Cl is its symbol

3. It is estimatied to have an atomic mass value of 35.45 amu

4. Cl is assigned [Ne] 3s² 3p⁵ configuration

5. It is belonging to group 17 and p-block

NCERT Chemistry Notes:

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

18. Argon

1. atomic number of argon is 18

2. Ar is its symbol

3. It is estimatied to have an atomic mass value of 39.948 amu

4. Ar is assigned [Ne] 3s² 3p⁶ configuration

5. It is belonging to group 18 and p-block

19. Potassium:

1. atomic number of Potassium is 19

2. the latin name of potassium is found to be Kalium

3. K is its symbol

4. It is estimatied to have an atomic mass value of 39.093 amu

5. K is assigned [Ar] 4s¹ configuration

6. It is belonging to group 1 and s-block

20. Calcium:

• atomic number of Calcium is 20.

• Ca is its symbol

• It is estimatied to have an atomic mass value of 40.10 amu

• Ca is assigned [Ar] 4s¹ configuration

• It is belonging to group 14 and s-block

Also check-

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