An ion is an atom that lost or gained one or more electron. A positive ion is an atom that lost an electron while a negative ion is an atom that gained an electron. Metals form positive ions while non-metals form negative ions. Monovalent Divalent Trivalent Magnesium Mg2+ Aluminium Al3+ Hydrogen H+ Calcium Iron III Ca2+ Fe3+ Sodium Na+ Barium Nitrogen Ba2+ N3- Potassium K+ Copper II Cu2+ Floride F+ Iron II Fe2+ Silver Ag+ Zinc Zn2+ Chloride Cl- Lead II Pb2+ Bromide Br- Oxygen O2- Sulphur S2- An atomic group is a group of atoms that are bonded together & go into chemical reactions as one atom. Atomic groups Formula Valency Hydroxide (OH)- Nitrate (NO3) - 1 Nitrite (NO2) - Bicarbonate (HCO 3) - Ammonium (NH4) + Carbonate (CO3) 2- 2 Sulphate (SO4)2- 3 Phosphate (PO4)3-
An ion is an atom that lost or gained one or more electron. A positive ion is an atom that lost an electron while a negative ion is an atom that gained an electron. Metals form positive ions while non-metals form negative ions. Monovalent Divalent Trivalent Hydrogen Sodium Potassium Floride Silver Chloride Bromide H+ Na+ K+ F+ Ag+ Cl- Br- Magnesium Calcium Barium Copper II Iron II Zinc Lead II Oxygen Sulphur Mg2+ Ca2+ Ba2+ Cu2+ Fe2+ Zn2+ Pb2+ O2- S2- Aluminium Iron III Nitrogen Al3+ Fe3+ N3- An atomic group is a group of atoms that are bonded together & go into chemical reactions as one atom. Atomic groups Formula Valency Hydroxide Nitrate Nitrite Bicarbonate Ammonium (OH)- (NO3) - (NO2) - (HCO 3) - (NH4) + 1 Carbonate Sulphate (CO3) 2- (SO4)2- 2 Phosphate (PO4)3- 3
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