Question

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.​

Answer 1

Answer:

Hydrogen (H) Atomic Number: 1 Valency = 1

Helium (He) Atomic Number: 2 Valency = 0

Lithium(Le) Atomic Number: 3 Valency = 1

Beryllium(Be) Atomic Number: 4 Valency = 2

Boron(B) Atomic Number: 5 Valency = 3

Carbon(C) Atomic Number: 6 Valency = 4

Nitrogen(N) Atomic Number: 7 Valency = 3

Oxygen(O) Atomic Number: 8 Valency = 2

Fluorine(F) Atomic Number: 9 Valency = 1

Neon (Ne) Atomic Number: 10 Valency = 0

Sodium(Na) Atomic Number: 11 Valency = 1

Magnesium(Mg) Atomic Number: 12 Valency = 2

Aluminium(Al) Atomic Number: 13 Valency = 3

Silicon(Si) Atomic Number: 14 Valency = 4

Phosphorus(P) Atomic Number: 15 Valency = 3

Sulphur(S) Atomic Number: 16 Valency = 2

Chlorine(Cl) Atomic Number: 17 Valency = 1

Argon(Ar) Atomic Number: 18 Valency = 0

Answer 2

Answer:

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