Jan. 14 presentation
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![Page 1: Jan. 14 presentation](https://reader034.fdocuments.net/reader034/viewer/2022052522/5550405cb4c9058f768b4992/html5/thumbnails/1.jpg)
THE CHEMISTRY
OF LIFE
CHAPTER 2
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ATOMS
AN ATOM IS THE BASIC
UNIT OF MATTER
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ATOMS
ATOMS ARE MADE UP OF
PROTONS, NEUTRONS, AND
ELECTRONS
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ATOMS
PROTONS ARE POSITIVELY CHARGED
PARTICLESNEUTRONS HAVE NO CHARGEELECTRONS ARE NEGATIVELY
CHARGED PARTICLES
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ATOMS
THE CENTER OF THE ATOM
IS THE NUCLEUS, AND IS
MADE UP OF PROTONS AND
NEUTRONS
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ATOMS
ELECTRONS, THE
NEGATIVELY CHARGED
PARTICLES, ARE IN
CONSTANT MOTION IN THE
SPACE AROUND THE
NUCLEUS
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ATOMS
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ATOMS
ATOMS HAVE AN EQUAL
NUMBER OF PROTONS AND
ELECTRONS, AND HAVE
EQUAL BUT OPPOSITE
CHARGES. ATOMS ARE
THEREFORE NEUTRAL.
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ELEMENTS
AN ELEMENT IS A PURE SUBSTANCE
THAT CONSISTS OF ONE TYPE OF
ATOMTHERE ARE OVER 100 KNOWN
ELEMENTS, WHILE ONLY ABOUT 24
ARE COMMONLY FOUND IN LIVING
ORGANISMS
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ELEMENTS
THE NUMBER OF PROTONS IN AN
ATOM OF AN ELEMENT IS THE
ATOMIC NUMBERFOR EXAMPLE,THE ATOMIC # FOR
CARBON IS 6. CARBON THEREFORE
HAS 6 PROTONS, AND 6 ELECTRONS
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ISOTOPES
ISOTOPES ARE ATOMS OF
THE SAME ELEMENT THAT
DIFFER IN THE NUMBER OF
NEUTRONS THEY CONTAIN
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ISOTOPES
THE MASS NUMBER IS THE
SUM OF THE PROTONS AND
NEUTRONS IN AN ATOMS
NUCLEUS
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ISOTOPES
ISOTOPES ARE IDENTIFIED
BY THEIR MASS NUMBER
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ISOTOPES
BECAUSE ISOTOPES HAVE
THE SAME NUMBER OF
ELECTRONS, ALL ISOTOPES
OF AN ELEMENT HAVE THE
SAME CHEMICAL
PROPERTIES