Question

atomic number its symbol and names and valency of the first 30 elements

Answer 1

NUMBER SYMBOL ELEMENT VALENCE
1 H Hydrogen 1, 0, -1
2 He Helium 0
3 Li Lithium 1, -1
4 Be Beryllium 2
5 B Boron 3, 2, 1
6 C Carbon 4, 3, 2, 1, -1, -2, -4
7 N Nitrogen 5, 4, 3, 2, 1, 0, -1, -2, -3
8 O Oxygen 2, 1, 0, -1, -2
9 F Fluorine 0, -1
10 Ne Neon 0
11 Na Sodium 1, -1
12 Mg Magnesium 2
13 Al Aluminum 3, 1
14 Si Silicon 4, 3, 2, 1, -1, -2, -4
15 P Phosphorus 5, 4, 3, 2, 1, 0, -1, -2, -3
16 S Sulfur 6, 5, 4, 3, 2, 1, 0, -1, -2
17 Cl Chlorine 6, 5, 4, 3, 2, 1, 0, -1, -2
18 Ar Argon 0
19 K Potassium 1, -1
20 Ca Calcium 2
21 Sc Scandium 3, 2, 1
22 Ti Titanium 4, 3, 2, 0, -1, -2
23 V Vanadium 5, 4, 3, 2, 1, 0, -1, -2
24 Cr Chromium 6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -4
25 Mn Manganese 7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -3
26 Fe Iron 6, 5, 4, 3, 2, 1, 0, -1, -2
27 Co Cobalt 5, 4, 3, 2, 1, 0, -1
28 Ni Nickel 6, 4, 3, 2, 1, 0, -1
29 Cu Copper 4, 3, 2, 1, 0
30 Zn Zinc 2, 1, 0
31 Ga Gallium 3, 2, 1
32 Ge Germanium 4, 3, 2, 1
33 As Arsenic 5, 3, 2, -3
34 Se Selenium 6, 4, 2, 1, -2
35 Br Bromine 7, 5, 4, 3, 1, 0, -1
36 Kr Krypton 2, 0
37 Rb Rubidium 1, -1
38 Sr Strontium 2
39 Y Yttrium 3, 2
40 Zr Zirconium 4, 3, 2, 1, 0, -2

Answer 2

Valency of 1st 14 are given here.....
Hope its helpful.