THE CHEMISTRY
    OF LIFE


   CHAPTER 2
ATOMS


AN ATOM IS THE BASIC
UNIT OF MATTER
ATOMS

ATOMS ARE MADE UP OF
PROTONS, NEUTRONS, AND
ELECTRONS
ATOMS

PROTONS ARE POSITIVELY CHARGED
PARTICLES
NEUTRONS HAVE NO CHARGE
ELECTRONS ARE NEGATIVELY
CHARGED PARTICLES
ATOMS

THE CENTER OF THE ATOM
IS THE NUCLEUS, AND IS
MADE UP OF PROTONS AND
NEUTRONS
ATOMS
ELECTRONS, THE
NEGATIVELY CHARGED
PARTICLES, ARE IN
CONSTANT MOTION IN THE
SPACE AROUND THE
NUCLEUS
ATOMS
ATOMS
ATOMS HAVE AN EQUAL
NUMBER OF PROTONS AND
ELECTRONS, AND HAVE
EQUAL BUT OPPOSITE
CHARGES. ATOMS ARE
THEREFORE NEUTRA...
ELEMENTS
AN ELEMENT IS A PURE SUBSTANCE
THAT CONSISTS OF ONE TYPE OF
ATOM
THERE ARE OVER 100 KNOWN
ELEMENTS, WHILE ONLY AB...
ELEMENTS
THE NUMBER OF PROTONS IN AN
ATOM OF AN ELEMENT IS THE
ATOMIC NUMBER
FOR EXAMPLE,THE ATOMIC # FOR
CARBON IS 6. CAR...
ISOTOPES

ISOTOPES ARE ATOMS OF
THE SAME ELEMENT THAT
DIFFER IN THE NUMBER OF
NEUTRONS THEY CONTAIN
ISOTOPES

THE MASS NUMBER IS THE
SUM OF THE PROTONS AND
NEUTRONS IN AN ATOMS
NUCLEUS
ISOTOPES
ISOTOPES ARE IDENTIFIED
BY THEIR MASS NUMBER
ISOTOPES
BECAUSE ISOTOPES HAVE
THE SAME NUMBER OF
ELECTRONS, ALL ISOTOPES
OF AN ELEMENT HAVE THE
SAME CHEMICAL
PROPERTIES
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Jan. 14 presentation

  1. 1. THE CHEMISTRY OF LIFE CHAPTER 2
  2. 2. ATOMS AN ATOM IS THE BASIC UNIT OF MATTER
  3. 3. ATOMS ATOMS ARE MADE UP OF PROTONS, NEUTRONS, AND ELECTRONS
  4. 4. ATOMS PROTONS ARE POSITIVELY CHARGED PARTICLES NEUTRONS HAVE NO CHARGE ELECTRONS ARE NEGATIVELY CHARGED PARTICLES
  5. 5. ATOMS THE CENTER OF THE ATOM IS THE NUCLEUS, AND IS MADE UP OF PROTONS AND NEUTRONS
  6. 6. ATOMS ELECTRONS, THE NEGATIVELY CHARGED PARTICLES, ARE IN CONSTANT MOTION IN THE SPACE AROUND THE NUCLEUS
  7. 7. ATOMS
  8. 8. ATOMS ATOMS HAVE AN EQUAL NUMBER OF PROTONS AND ELECTRONS, AND HAVE EQUAL BUT OPPOSITE CHARGES. ATOMS ARE THEREFORE NEUTRAL.
  9. 9. ELEMENTS AN ELEMENT IS A PURE SUBSTANCE THAT CONSISTS OF ONE TYPE OF ATOM THERE ARE OVER 100 KNOWN ELEMENTS, WHILE ONLY ABOUT 24 ARE COMMONLY FOUND IN LIVING ORGANISMS
  10. 10. ELEMENTS THE NUMBER OF PROTONS IN AN ATOM OF AN ELEMENT IS THE ATOMIC NUMBER FOR EXAMPLE,THE ATOMIC # FOR CARBON IS 6. CARBON THEREFORE HAS 6 PROTONS, AND 6 ELECTRONS
  11. 11. ISOTOPES ISOTOPES ARE ATOMS OF THE SAME ELEMENT THAT DIFFER IN THE NUMBER OF NEUTRONS THEY CONTAIN
  12. 12. ISOTOPES THE MASS NUMBER IS THE SUM OF THE PROTONS AND NEUTRONS IN AN ATOMS NUCLEUS
  13. 13. ISOTOPES ISOTOPES ARE IDENTIFIED BY THEIR MASS NUMBER
  14. 14. ISOTOPES BECAUSE ISOTOPES HAVE THE SAME NUMBER OF ELECTRONS, ALL ISOTOPES OF AN ELEMENT HAVE THE SAME CHEMICAL PROPERTIES

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