the atom
DESCRIPTION
The Atom. Created by Dr. A. Davila. Atoms and Their Electrons . Classroom Media, 1995. Full Video. 30 September 2010. . Elements in the Human Body. Composition of Air. Composition of the Air on Planet Earth. Elements in Our Body and Atmosphere. - PowerPoint PPT PresentationTRANSCRIPT
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The AtomCreated by Dr. A. Davila
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What is it?
Atom
The simplest form of a
substance.
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What is it?
Where is it found?
AtomThe s implest
form of a substance.
The universe is made of many
different types of substances, or
matter.
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What is it?
Where is it found?
What is it called?
AtomThe simplest
form of a substance.
The universe is made of many different types of substances, or matter.
Each different type of
matter is called an element.
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What is it?
Where is it found?
What is it called?
What is an element?
Atom The s implest form of a
substance.
The universe is made of many different types of substances, or matter.
Each different type of matter is called
an element.
An element is the simplest
form of matter
and is made of the same type
of atoms.
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What is it?
Where is it found?
What is it called?
What is an element?
What if they combine?
Atom The s implest form of a
substance.
The universe is
made of many
different types of
substances ,
or matter.
Each different type of
matter is called an element.
An element is the
simplest form of
matter and is
made of the same type of
atoms.
If two or more atoms combine it is called a molecule.
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What is it?
Where is it found?
What is it called?
What is an element?
What if they combine?
What if they are different
atoms?
Atom The s implest form of a
substance.
The universe is made of many different types of substances , or matter.
Each different type of matter is called
an element.An element is the simplest form of matter
and is made of the same type of atoms.
If two or more atoms combine it is called a molecule.
Atoms of different elements may join together
chemically to form a
compound.
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What is it?
Where is it found?
What is it called?
What is an element?
What if they combine?
What if they are different
atoms?
How are they
described?
Atom The simplest form of a
substance.
The universe is made of many different types of substances, or matter.
Each different type of matter is called
an element.An element is the simplest form of matter
and is made of the same type of atoms.
If two or more atoms combine it is called a molecule.
Atoms of different elements may join
together chemically to form a compound.
They are often described using
chemical formulas.
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• Atoms and Their Electrons.Classroom Media, 1995. Full Video.30 September 2010. <http://www.discoveryeducation.com/>.
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What is it?
Where is it found?
What is it called?
What is an element?
What if they combine?
What if they are different
atoms?
How are they
described?
AtomThe s implest form of
a substance.
The universe is made of many different
types of substances ,
or matter. Each different type of matter is
called an element.
An element is the simplest form of
matter and is made
of the same type of atoms.
If two or more atoms combine
it is called a molecule.
Atoms of different elements may join
together chemically to
form a compound.
They are often described using
chemical
formulas .
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Elements in the Human Body
65%
18%
10%
3%2%2%
Oxygen
Carbon
Hydrogen
Nitrogen
Calcium
Other
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Composition of AirCOMPONENT VOLUME
Nitrogen 78%
Oxygen 21%
Other 1%
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Composition of the Air on Planet Earth
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Elements in Our Body and Atmosphere
N19
7Nitrogen
2 5
+3
O16
8Oxygen2 6
-2
Na23
11Sodium2 1
+1
39.1
20Calcium2
+2
8
Ca8 28
Ar39.9
18Sodium2 8
0
1
1Calcium
-1
8
H1
12
6Calcium2
+/-2
C4
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The Carbon Cycle
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Describe an Element
• Identify the element• Provide the elements’ symbols• Provide its atomic number and atomic mass• What is its appearance, its other properties• Explain its uses • How would you classify it?
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contains asurrounded by
ofcomposed
which is different for different
which is the same for different
which determine the
which are added together to find
the
contains
arranged on the
An atom
elec trons nucleus
neutronsprotons
atomic number
massnumber
isotopes H1
1.01
atomic number
atomic mass
Chemic al or Element
Symbol
elements
periodic table
neutrons
protons
HydrogenElement Name
M &A D áv ila
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Common Gases
Oxygen
O2
Chlorine
Cl2
Ammonia
NH3
Hydrogen
H2
Helium
He
Carbon dioxide
CO2
respiration,support of
combustion
bleac h, dis infectant
fertilizer, manufacture of
plastic
Chemic al reagent, fuel for
fuel cells
Lifting gas for balloons
Plants need it to complete
photosynthesis
Nitrogen
N2
Manufacture of ammonia
Sulfur dioxide
SO2
Preservation, dis infectant,
bleac h
formula formula formula formula formula formula formula formula
substance substancesubstance substance
typical usage typical usage typical usage typical usage typical usage typical usage typical usage typical usage
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Solids
Aluminum
Al
Copper
Cu
I ron
Fe
Magnesium
Mg
Water (ic e)
H2O
Gold
Au
formula formulaformula
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Sodium C hloride (salt)
NaCl
Sucrose (sugar)
C12H22O11
Water
H2O
Others
Iodine
l2
Baking Soda
NaHCO3
Vinegar
C2H4O2
formulaformula formula
Hydrogen Peroxide
H2O2
Maylanta or Maalox
(antacids)
Al(OH3)
milk of magnesia(antacid)
Mg(OH)2(s)
formula
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periods groups metals metalloids nonmetals Atomic # always
capitalized
Nevercapitalized
dissimilar similar malleable
electricalconductor
brittle
Electrical insulator
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metals
nonmetals
Shiny luster
dull luster
conductor
insultor
malleable
high melting point
brittle
low melting point
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Democritus disagreed with other philosophers who thought that matter could be explained only by
descriptive terms. In his view, all of the descriptions of matter were secondary to the identity of the atoms
making it up.
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Rutherford called the positively
charged, central part of the atom the nucleus. He
named the positively charged
particles in the nucleus protons.
He also suggested that electrons
were scattered in the mostly empty space around the
nucleus. Thee atoms must be made of mostly
empty space.
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Niels Bohr found evidence that electrons in atoms are arranged in energy levels. The lowest energy level is closest to the nucleus
and can hold only two electrons. Higher energy levels are farther from the nucleus and can contain more electrons.
This simplified model shows a nucleus of protons and neutrons and electron paths based on energy levels.
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The Modern Atomic Model As a result of continuing research, scientists now realize that
because electrons have characteristics that are similar to waves and particles, their energy levels are not defined, planetlike orbits around the nucleus. Rather, it seems most likely that electrons move in what is called the atom's electron cloud.
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Lavoisier showed that wood and the oxygen it combines with during burning have the same mass as the ash, water, carbon dioxide, and other gases that
are produced. In a similar way, an iron bar, oxygen, and water have the same mass as the rust that forms when they interact. From Lavoisier's work came the law of conservation of matter, which states that matter is not created or
destroyed? Matter only changes form.
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