Write down the Names, Symbols, Atomic Number, Electronic Configuration (on the basis

of K,L,M,N) and the Valency of a

Write down the Names, Symbols, Atomic Number, Electronic Configuration (on the basis

of K,L,M,N) and the Valency of all the elements from Atomic Number 1 to 20.​

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  1. Answer:

    1) Hydrogen (H)

    Atomic Number: 1

    Valency = 1

    2)Helium (He)

    Atomic Number: 2

    Valency = 0

    3)Lithium(Le)

    Atomic Number: 3

    Valency = 1

    4)Beryllium(Be)

    Atomic Number: 4

    Valency = 2

    5)Boron(B)

    Atomic Number: 5

    Valency = 3

    6)Carbon(C)

    Atomic Number: 6

    Valency = 4

    7)Nitrogen(N)

    Atomic Number: 7

    Valency = 3

    8)Oxygen(O)

    Atomic Number: 8

    Valency = 2

    9)Fluorine(F)

    Atomic Number: 9

    Valency = 1

    10)Neon (Ne)

    Atomic Number: 10

    Valency = 0

    11)Sodium(Na)

    Atomic Number: 11

    Valency = 1

    12) Magnesium(Mg)

    Atomic Number: 12

    Valency = 2

    13) Aluminium(Al)

    Atomic Number: 13

    Valency = 3

    14) Silicon(Si)

    Atomic Number: 14

    Valency = 4

    15) Phosphorus(P)

    Atomic Number: 15

    Valency = 5 , 3

    16) Sulphur(S)

    Atomic Number: 16

    Valency = 2

    17) Chlorine(Cl)

    Atomic Number: 17

    Valency = 1

    18) Argon(Ar)

    Atomic Number: 18

    Valency = 0

    19) Potassium(K)

    Atomic Number: 19

    Valency = 1

    20) Calcium (Ca)

    Atomic Number: 20

    Valency = 2

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