Valency chart for chemistry ICSE - ICSE CHEMISTRY CLASS 10

Valency chart - for writing chemical formulas of chemical compounds - criss-cross method

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This valency (oxidation states) chart helps in writing the molecular formula of chemical compounds

Positive ions/radicals		Negative ions/radicals
Monovalent (valency-I)
Potassium	K+	Chloride	Cl–
Sodium	Na+	Bromide	Br–
Copper(I)/ Cuprous	Cu+	Iodide	I–
Mercury(I)/ Mercurous	Hg+	Hydroxide	OH–
Silver(I)/ Argentous	Ag+	Hydrogen carbonate/ bi carbonate	HCO3–
Ammonium	NH4+	Hydrogen sulphite/ bi sulphite	HSO3–
Hydrogen	H+	Hydrogen sulphate/ bi sulphate	HSO4–
		Nitrite	NO2–
		Nitrate	NO3–
Divalent (valency-II)
Calcium	Ca2+	Carbonate	CO32–
Magnesium	Mg2+	sulphite	SO32–
Zinc	Zn2+	sulphate	SO42–
Iron(II)/ ferrous	Fe2+	sulphide	S2–
Lead(II)/ plumbous	Pb2+	oxide	O2–
Nickel	Ni2+	dichromate	Cr2O72–
Cobalt	Co2+	zincate	ZnO22–
Copper(II) /cupric	Cu2+	plumbite	PbO22–
Mercury(II)/ mercuric	Hg2+
Silver(II)/ argentic	Ag2+
Tin(II) stannous	Sn2+
Tri valent (valency-III)
Aluminium	Al3+	nitride	N3–
Iron(III)/ ferric	Fe3+	Phosphate	PO43–
Chromium	Cr3+
TETRA valent(valency-IV)
Lead(IV)/ plumbic	Pb4+	Carbide	C4–
Tin(IV) /stannic	Sn4+

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