Download Isotopes and Ions

Isotopes and Ions
Normal Conditions


Normal atoms = represented by symbol
o Atomic number  never changes for a given element
Normally, atomic mass and number of electrons are a set value
o However, not all atoms of the same element will always have the same
number of protons and neutrons
Isotopes
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
Isotopes = atoms of the same element that have a different number of neutrons
o Represented through symbol and total atomic mass of the isotope
 Example = chlorine – 37 (Cl – 37)
Comparison
o Normal atom
 Cl (Chlorine)
 Atomic Number: 17
 Atomic Mass: 35
 # Protons: 17
 # Electrons: 17
 # Neutrons: 18
o Isotope
 Chlorine – 37 (Cl – 37)
 Atomic Number: 17
 Atomic Mass: 37
 # Protons: 17
 # Electrons: 17
 # Neutrons: 20
Ions
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Ions = atoms of the same element that have a different number of electrons
o Represented through symbol and overall charge of the ion
 Example = chlorine-1 (Cl-1)
Comparison
Normal atom
Ion+1
Ion-1
Cl (chlorine)
Cl+1 (chlorine+1)
Cl-1(chlorine-1)
Atomic #: 17
Atomic #: 17
Atomic #: 17
Atomic Mass: 35
Atomic Mass: 35
Atomic Mass: 35
# Protons: 17
# Protons: 17
# Protons: 17
# Neutrons: 18
# Neutrons: 18
# Neutrons: 18
# Electrons: 17
# Electrons: 16
# Electrons: 18