Question

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Name first 20 element of periodic table. their atomic no and weight & easy way too learn ​

Answer 1

Answer:

In order of increasing atomic number, the first 20 elements and their symbols are:

• :Hydrogen (H),Atomic Number: 1,Mass: 1.008
• Helium (He),Number: 2, Mass: 4.002602(2)
• Lithium (Li), Number: 3, Mass: 6.94
• Beryllium (Be),Number: 4, Mass: 9.0121831(5)
• Boron (B), Number: 5, Mass: 10.81
• Carbon (C),Number: 6, Mass: 12.011
• Nitrogen (N), Number: 7, Mass: 14.007
• Oxygen (O), Number: 8, Mass: 15.999 or 16.00
• Fluorine (F), Number: 9, Mass: 18.998403163(6)
• Neon (Ne), Number: 10, Mass: 20.1797(6)
• Sodium (Na), Number: 11 , Mass: 22.98976928
• Magnesium (Mg), Number: 12, Mass: 24.305
• Aluminum (Al), Number: 13, Mass: 26.9815385
• Silicon (Si), Number: 14, Mass: 28.085
• Phosphorus (P) , Number: 15, Mass: 30.9737
• Sulfur (S), Number: 16, Mass: 32.06
• Chlorine (Cl), Number: 17, Mass: 35.45
• Argon (Ar), Number: 18, Mass: 39.948
• Potassium (K), Number: 19, Mass: 39.0983
• Calcium (Ca), Number: 20, Mass: 40.078

Answer 2

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Periodic table is arrangement of elements in vertical column & horizontal rows on the basis of their properties.

The first 20 elements of periodic table :-

• Hydrogen

Symbol = H

Atomic Mass = 1.0

Atomic Number = 1

• Helium

Symbol = He

Atomic Mass = 4.0

Atomic Number = 2

• Lithium

Symbol = Li

Atomic Mass = 6.9

Atomic Number = 3

• Beryllium

Symbol = Be

Atomic Mass = 9.0

Atomic Number = 4

• Boron

Symbol = B

Atomic Mass = 10.8

Atomic Number = 5

• Carbon

Symbol = C

Atomic Mass = 12

Atomic Number = 6

• Nitrogen

Symbol = N

Atomic Mass = 14

Atomic Number = 7

• Oxygen

Symbol = O

Atomic Mass = 16

Atomic Number = 8

• Fluorine

Symbol = F

Atomic Mass = 19

Atomic Number = 9

• Neon

Symbol = Ne

Atomic Mass = 20.2

Atomic Number = 10

• Sodium

Symbol = Na

Atomic Mass = 23

Atomic Number = 11

• Magnesium

Symbol = Mg

Atomic Mass = 24.3

Atomic Number = 12

• Aluminium

Symbol = Al

Atomic Mass = 27.0

Atomic Number = 13

• Silicon

Symbol = Si

Atomic Mass = 28.1

Atomic Number = 14

• Phosphorus

Symbol = P

Atomic Mass = 31

Atomic Number = 15

• Sulphur

Symbol = S

Atomic Mass = 32.1

Atomic Number = 16

• Chlorine

Symbol = Cl

Atomic Mass = 35.5

Atomic Number = 17

• Argon

Symbol = Ar

Atomic Mass = 39.9

Atomic Number = 18

• Potassium

Symbol = K

Atomic Mass = 39.1

Atomic Number = 19

• Calcium

Symbol = Ca

Atomic Mass = 40.1

Atomic Number = 20

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First 10 :-

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• Hydrogen

• Helium

• Lithium

• Beryllium

• Boron

• Carbon

• Nitrogen

• Oxygen

• Fluorine

• Neon

11 to 20 :-

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• Sodium

• Magnesium

• Aluminium

• Silicon

• Phosphorus

• Sulfur

• Chlorine

• Argon

• Potassium

• Calcium

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