Question

first 20 elements with the valency

Answer 1

Dear Student,

For your grade, the first twenty elements are important. You can learn the valencies of first twenty elements (and a few other metals like iron which shows valencies of 2 and 3, zinc which show a valency of 2, copper which shows a valency of 2 and sometimes 1 etc), that would be sufficient. Also, many elements may show variable that is more than one valency. Following is the list of first 30 elements with their names, symbols, atomic numbers and valencies they show

Element	Symbol	Atomic number	Valency
Hydrogen	H	1	1
Helium	He	2	0
Lithium	Li	3	1
Beryllium	Be	4	2
Boron	B	5	3
Carbon	C	6	4
Nitrogen	N	7	3
Oxygen	O	8	2
Fluorine	F	9	1
Neon	Ne	10	0
Sodium	Na	11	1
Magnesium	Mg	12	2
Aluminium	Al	13	3
Silicon	Si	14	4
Phosphorus	P	15	3, 5
Sulphur	S	16	2, 4, 6
Chlorine	Cl	17	1
Argon	Ar	18	0
Potassium	K	19	1
Calcium	Ca	20	2
Scandium	Sc	21	2, 3
Titanium	Ti	22	2, 3, 4
Vanadium	V	23	2, 3, 4, 5
Chromium	Cr	24	1, 2, 3, 4, 5, 6
Manganese	Mn	25	2, 3, 4, 5, 6, 7
Iron	Fe	26	2, 3, 4, 5, 6
Cobalt	Co	27	2, 3, 4, 5
Nickel	Ni	28	2, 3, 4
Copper	Cu	29	1, 2, 3
Zinc	Zn	30	2

Regards!