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Atomic Structure –
cont…
Isotopes
Elements are defined by the number of protons
(atomic #, Z).
Atoms of an element with the same # of protons and
e...
Isotopes - hydrogen
Isotopes - chlorine
Chlorine Protons Electrons Neutrons
n
Isotopes - chlorine
Chlorine Protons Electrons Neutrons
n
17 17
17 17
Isotopes - chlorine
Chlorine Protons Electrons Neutrons
n
17 17 35-17=18
17 17 37-17 = 20
Isotopes
Practice Problems…..
Relative Atomic Mass
(Ar)
oHow we compare the
mass of atoms
oBased on Carbon
atom
oAtomic mass units
(amu)
Element Ar
H 1
...
Relative Atomic Mass
(Ar)
Calculate the relative atomic mass (Ar) or Chlorine.
25 % 75 %
(75x35) + (25x37)= 35.5 amu
100
Arrangement of Electrons in
Atoms
Electrons move very fast around the
nucleus
It is impossible to pinpoint their
locatio...
Arrangement of Electrons in
Atoms
1st level – 2
2nd level – 8
3rd level – 18 (when 8 are present next two
jump to level-4,...
Arrangement of Electrons in
Atoms
Bohr-Rutherford Diagrams
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Atomic structure – cont

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Atomic structure – cont

  1. 1. Atomic Structure – cont…
  2. 2. Isotopes Elements are defined by the number of protons (atomic #, Z). Atoms of an element with the same # of protons and electrons, but different # of neutrons. ◦ Same atomic # (Z) but different mass # (A) ◦ Same chemical properties, however some are radioactive
  3. 3. Isotopes - hydrogen
  4. 4. Isotopes - chlorine Chlorine Protons Electrons Neutrons n
  5. 5. Isotopes - chlorine Chlorine Protons Electrons Neutrons n 17 17 17 17
  6. 6. Isotopes - chlorine Chlorine Protons Electrons Neutrons n 17 17 35-17=18 17 17 37-17 = 20
  7. 7. Isotopes Practice Problems…..
  8. 8. Relative Atomic Mass (Ar) oHow we compare the mass of atoms oBased on Carbon atom oAtomic mass units (amu) Element Ar H 1 C 12 O 16 Mg 24 Cl 35.5
  9. 9. Relative Atomic Mass (Ar) Calculate the relative atomic mass (Ar) or Chlorine. 25 % 75 % (75x35) + (25x37)= 35.5 amu 100
  10. 10. Arrangement of Electrons in Atoms Electrons move very fast around the nucleus It is impossible to pinpoint their location Electrons are arranged in energy levels and cannot be between them.
  11. 11. Arrangement of Electrons in Atoms 1st level – 2 2nd level – 8 3rd level – 18 (when 8 are present next two jump to level-4, then following return to level-3) 4th level - 2
  12. 12. Arrangement of Electrons in Atoms Bohr-Rutherford Diagrams

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