ATOMS

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ATOMS
And the Periodic Table
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Atom
Smallest part of any element that contains all
properties of that element.
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Subatomic
Particles
Review
Particles that are smaller than an atom.
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3 main subatomic particles are the proton,
neutron and electron.
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Nucleus
The center of an atom.
It contains two particles neutron and proton.
Has a positive charge.
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______
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Proton
Positively charged particle found in the nucleus.
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Proton
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Neutron
Particle in the nucleus of an atom that does not
have a charge.
It is a neutral particle.
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Neutron
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Electron
Particle orbiting the nucleus of an atom.
It has a negative charge.
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Electron
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Number of Protons
Equals
Number of electrons
This is what gives the atom a neutral charge.
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The Big Picture!
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Neutron
Proton
Electron
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Is a chart that contains all the information of
the 109 elements found on Earth.
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Are the simplest type of pure substances.
They occur naturally within the Earth.
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Reading the
Periodic Table
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Explains how to read the information that is
given in each square of the periodic table.
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represents the number of protons found in the
atoms nucleus.
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Atomic Number
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None of the elements have the same number of
protons.
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You can determine the element by knowing the
atomic number.
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Atomic
Number
Practice
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Which element has the atomic number 26?
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Consists of one or two letters that represents
that element.
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Symbol
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First letter is always capitalized.
Fe
H
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If there is a second letter, it is written in
lower case.
Fe
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Symbol
Practice
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How would you write the symbol for Neon?
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The
Name of the Element
is always spelled out.
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Element Name
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Element
Name
Practice
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What is the name of the element that has the
symbol Fe?
Iron
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The sum of the number of protons and number of
neutrons found in the nucleus of the atom for
that element.
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Protons Neutrons
Atomic Mass

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Atomic Mass
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Atomic
Mass
Practice
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What is the atomic mass if an atom has 2 protons
and 2 neutrons?
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How many protons does an atom have if its atomic
mass is 12 and it has 6 neutrons?
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Which element has an atomic mass of 12 and
contains 6 neutrons?
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How many neutrons does an atom contain if its
atomic mass is 65 and it contains 30 protons?
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Which element has an atomic mass of 65 and
contains 30 protons?
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Valence
Electron
Electrons in the OUTERMOST energy level of an
atom.
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Valence Electron
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Valence
Electron
Determines how atoms will combine.
Groups on the periodic table can be arranged by
Valence Electrons
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Example Group 1 elements on the periodic table
each have one valence electron.
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An atom that has lost or gained one or more
electrons. It is no longer neutrally charged.
Ion
Cation ion with a positive charge
Anion ion with a negative charge
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Isotope
An atom that has the same number of protons and
electrons, but a different number of neutrons.