Question

Write the group numbers of first 20 elements of the periodic table.​

Answer 1

Answer:

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

Hydrogen (H)

Helium (He)

Lithium (Li)

Beryllium (Be)

Boron (B)

Carbon (C)

Nitrogen (N)

Oxygen (O)

Explanation:

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Answer 2

★Answer :

➙ The first 20 elements of the periodic table and thier symbols are :

• Hydrogen ( H )
• Helium ( He )
• Lithium ( Li )
• Beryllium ( Be )
• Boron ( B )
• Carbon ( C )
• Nitrogen ( N )
• Oxygen ( O )
• Fluorine ( F )
• Neon ( Ne )
• Sodium ( Na )
• Magnesium ( Mg )
• Alluminium ( Al )
• silicon ( Si )
• phosphorous ( P )
• Sulphur ( S )
• Chlorine ( Cl )
• Argan ( Ar )
• Pottasium ( K )
• Calcium ( Ca )

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