ions. ions charged particles which form when an atom (or group of atoms) gains or loses electrons
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IONS
Ions• Charged particles which form when an atom (or group of atoms) gains or loses electrons.
Ions• Charged particles which form when an atom (or group of atoms) gains or loses electrons.• Ions don’t have equal number of PROTONS and ELECTRONS
Ions• Charged particles which form when an atom (or group of atoms) gains or loses electrons.• Ions don’t have equal number of PROTONS and ELECTRONS• Each ion (or group) is represented by a symbol which shows the charge of the atom
Ions• Charged particles which form when an atom (or a group of atoms) gains or loses electrons.• Ions don’t have equal number of PROTONS and ELECTRONS• Each ion (or group) is represented by a symbol which shows the charge of the atom• Metals form positively charged ions while non-metals may form negatively charged ions.
Ions• Charged particles which form when an atom (or a group of atoms) gains or loses electrons.• Ions don’t have equal number of PROTONS and ELECTRONS• Each ion (or group) is represented by a symbol which shows the charge of the atom• Metals form positively charged ions while non-metals may form negatively charged ions.• EG. Na+ is a sodium ion. The + means the charge is +1. This means it has LOST one electron.
Ions• Charged particles which form when an atom (or a group of atoms) gains or loses electrons.• Ions don’t have equal number of PROTONS and ELECTRONS• Each ion (or group) is represented by a symbol which shows the charge of the atom• Metals form positively charged ions while non-metals may form negatively charged ions.• EG. Na+ is a sodium ion. The + means the charge is +1. This means it has LOST one electron• EG. O2- is an oxide ion. The 2- sign means it has 2 more electrons than protons
Ions• Cations – positively charged ions that have lost electrons.
Ions• Cations – positively charged ions that have lost electrons.• Anions – negatively charged ions which have gained electrons.
Ions• Cations Anions
Symbol Name Symbol Name
K+ Potassium Cl- Chloride
H+ Hydrogen NO3- Nitrate
Na+ Sodium HCO3- Hydrogen
Carbonate
Li+ Lithium CH3COO- Ethanoate
Fe2+ Iron (II) OH- Hydroxide
Mg2+ Magnesium O2- Oxide
Ca2+ Calcium S2-
Cu2+ Copper (II) O2- Sulfide
Pb2+ Lead CO32- Carbonate
Zn2+ Zinc SO42- Sulfate
Al3+ Aluminium
Fe3+ Iron (III)
Questions:1. The chloride ion has 18 electrons and is charged -1.
a) Write the symbol for the chloride ion
b) How many protons has the chloride ion got?
2. The magnesium ion has 12 protons and is charged +2
c) Write down its symbol
d) Decide how many electrons the magnesium ion has
Fill in this table:
Name of element
Symbol Atomic number
Number of electrons
Ion(s) formed
Number of electrons lost or gained
Magnesium
Cl- One gained
Na 11
Cu2+ Two lost
Oxygen
19
Li+
Fill in this table:
Name of element
Symbol Atomic number
Number of electrons in the ion
Ion(s) formed
Number of electrons lost or gained
Magnesium
Mg 12 10 Mg2+ Two lost
Chlorine Cl 17 18 Cl- One gained
Sodium Na 11 10 Na+ One lost
Copper Cu 29 27 Cu2+ Two lost
Oxygen O 8 10 O2- Two gained
Potassium K 19 18 K+ One lost
Lithium Li 3 2 Li+ One lost
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