Objective – I can identify characteristics of an atom and molecule.
Atoms Fact Sheet
Atom
Parts of an element block
Atomic Weight/
mass
The simplest form of matter. An
element is made up of only one atom.
Atomic Symbol
Diagram of an Atom
Element Name
Element Number
Element Number – Where it is found on the
Subatomic Particles
Proton – positive charge.
Neutron – neutral/no charge
Electron – negative charge
Where are they found?
Proton – nucleus of atom
Neutron – nucleus of atom
Electron – orbiting nucleus
Key atom (element) facts
periodic table of elements. In this case, carbon
is element #6. It also identifies how many
protons and neutrons are found in the nucleus
(Carbon – 6 protons and 6 electrons).
Element Name – What the element is called.
Atomic Symbol – The symbol of the element
used in chemical formulas – H20 (H –
hydrogen [the “2” represents the number of
oxygen atoms); O – oxygen; CO2 (C – carbon;
O – oxygen [the “2” represents the number of
oxygen atoms])
Atomic Weight/Mass – The average weight
of an atom of an element. It may be higher
than the element number as it might have
more neutrons than protons. To determine
the approximate number of neutrons is to
subtract the number of protons (atomic
number) from the atomic weight/mass.
No two elements will have the same
element number and atomic symbol.
Element Block – gives information about
an atom.
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Objective – I can identify characteristics of an atom and molecule.
Helium (He) Atom
Aluminum (Al) Atom
Proton (2)
Neutron (2)
Electron (2)
Element #2
Atomic Weight/Mass – 4.0026 (the
.0026 is the weight of the electrons)
Oxygen (O) Atom
13 protons, 14 neutrons, 13 electrons
Proton (8)
Neutron (8)
Electron (8)
Element #13
Atomic Weight/Mass – 26.982 (the
.982 is the additional neutron)
Copper (Cu) Atom
Element #8
Atomic Weight/Mass – 15.999
29 protons, 35 neutrons, 29 electrons
Element #29
Atomic Weight/Mass – 63.546 (the
.546 is the additional neutrons)
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Objective – I can identify characteristics of an atom and molecule.
Molecules & Compounds
When two atoms come together, a
molecule is formed.
Water Molecule (H2O)
Two hydrogen atoms form a bond
with one oxygen atom = Water
(H2O).
Molecular Oxygen
Carbon Dioxide (CO2)
An oxygen atom has 6 electrons
in its outer shell.
Carbon has 4 electrons in its outer
shell.
Two oxygen atoms will each share
two electrons with carbon.
This is a picture of a carbon
dioxide (CO2) molecule.
Carbon Monoxide Molecule (CO)
Molecular Oxygen (O2)
An oxygen atom has 6 electrons
in its outer shell.
Oxygen and carbon share one
electron.
An oxygen atom has 6 electrons
in its outer shell.
Two oxygen atoms will each share
two electrons.
This is a picture of an oxygen
molecule.
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Objective – I can identify characteristics of an atom and molecule.
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