<P>Answer:

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

21) Scandium (Sc)

Atomic Number: 21

Valency = 3

22) Titanium (Ti)

Atomic Number: 22

Valency = 4

23) Vanadium (V)

Atomic Number: 23

Valency = 5 , 4

24) Chromium (Cr)

Atomic Number: 24

Valency = 2

25)Manganese(Mn)

Atomic Number: 25

Valency = 7 , 4 , 2

26)Iron (Fe)

Atomic Number: 26

Valency = 2 , 3

27) COBALT (Co)

Atomic Number: 27

Valency = 3 , 2

28)Nickel (Ni)

Atomic Number: 28

Valency = 2

29)Copper (Cu)

Atomic Number: 29

Valency = 2 , 1

30)Zinc(Zn)

Atomic Number: 30

Valency = 2