Question

Fist 20elements with their atomic masses and valency

Answer 1

d an answer on 24/5/13

S.No.	ELEMENT	Atomic mass	VALENCY
1	Hydrogen	1	1
2	Helium	4	0
3	Lithium	6.94	1
4	Beryllium	9	2
5	Boron	10.81	3
6	Carbon	12	2,4
7	Nitrogen	14	3,5
8	Oxygen	16	2
9	Fluorine	19	1
10	Neon	20	0
11	Sodium	22.99	1
12	Magnesium	24.31	2
13	Aluminum	27	3
14	Silicon	28	4
15	Phosphorus	31	3,5
16	Sulfur	32	2,4,6
17	Chlorine	35.45	1,3,5,7
18	Argon	40	0
19	Potassium	39	1
20	Calcium	40	2