Transcript The Atom - Hrsbstaff.ednet.ns.ca

Chemistry
The Atom
The Atom
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The nucleus of the atom is made up of protons
and neutrons.
Protons are positively charged.
Neutrons are neutral and have no charge. This
made them very difficult to find.
Electrons are located outside the nucleus and
are negatively charged.
The nucleus is heavier than the electrons and
stays still. The electrons move around the
nucleus.
The Atom Cont.
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Period on the periodic table represents
the number of shells or energy levels.
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The group on the periodic table refers to
the number of electrons in the outer
most shell.
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Atomic number tells you how many
protons that are in the atom.
Shells
Atoms are contained in shells.
 Shells are also known as energy levels.
 The number of shells depends upon its
place in the periodic table.
 The period number tells you how many
shells or energy levels an atom has.
 There are three main shells that we are
going to study.
 Sub shells are what is used after the first
three shells.
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Shells
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Shell #1 can only have 2 electrons.
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Shell #2 can only have 8 electrons.
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Shell #3 can only have 8 electrons.