1. Hydrogen (H)
- Atomic number: 1
- Atomic mass: 1.008
- Classification: Nonmetal
- Symbol: H
- Description: It is the lightest and most abundant element in the universe. It is a colorless, odorless and tasteless gas.

2. Helium (He)
- Atomic number: 2
- Atomic mass: 4.003
- Classification: Noble gas
- Symbol: He
- Description: It is a colorless, odorless and tasteless gas which is the second lightest element and is the second most abundant element in the observable universe.

3. Lithium (Li)
- Atomic number: 3
- Atomic mass: 6.941
- Classification: Alkali metal
- Symbol: Li
- Description: It is a soft, silvery-white metal with a low density and is the lightest metal.

4. Beryllium (Be)
- Atomic number: 4
- Atomic mass: 9.012
- Classification: Alkaline earth metal
- Symbol: Be
- Description: It is a hard, grayish metal that is very lightweight and has a high melting point.

5. Boron (B)
- Atomic number: 5
- Atomic mass: 10.81
- Classification: Metalloid
- Symbol: B
- Description: It is a metalloid which has some properties of both metals and nonmetals.

6. Carbon (C)
- Atomic number: 6
- Atomic mass: 12.01
- Classification: Nonmetal
- Symbol: C
- Description: It is a nonmetal which can form a variety of compounds due to its ability to bond with other elements.

7. Nitrogen (N)
- Atomic number: 7
- Atomic mass: 14.01
- Classification: Nonmetal
- Symbol: N
- Description: It is a nonmetal which makes up about 78% of the Earth's atmosphere.

8. Oxygen (O)
- Atomic number: 8
- Atomic mass: 16.00
- Classification: Nonmetal
- Symbol: O
- Description: It is a nonmetal which is essential for life and makes up about 21% of the Earth's atmosphere.

9. Fluorine (F)
- Atomic number: 9
- Atomic mass: 19.00
- Classification: Halogen
- Symbol: F
- Description: It is a highly reactive, pale yellow gas which is the most electronegative element.

10. Neon (Ne)
- Atomic number: 10
- Atomic mass: 20.18
- Classification: Noble gas
- Symbol: Ne
- Description: It is a colorless, odorless and tasteless gas which is the fourth most abundant element in the universe.

11. Sodium (Na)
- Atomic number: 11
- Atomic mass: 22.99
- Classification: Alkali metal
- Symbol: Na
- Description: It is a soft, silvery

Hydrogen,heliim,l lithium,berilium,b iron,carbon,neon,n nitrogen,oxygen,flurine,sodium,magnesium,s silicon,phosphorus,almunium,s sulphur,clorine,argon,calcium,and potassium......