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Transcript
Introduction to
elements and the
periodic table
Mrs. Rojas
Michael Abdelsayed
Protons and Electrons
 Protons
are positively charged
particles located at the nucleus
 Electrons
are negatively charged
particles located outside the nucleus
What is the PERIODIC TABLE?
o
Shows all known
elements in the universe.
o
Organizes the elements
by chemical properties.
How do you read the
PERIODIC TABLE?
What is the ATOMIC NUMBER?
o
o
The number of
protons found in the
nucleus of an atom
Or
The number of
electrons surrounding
the nucleus of an
atom.
What is the SYMBOL?
o
An abbreviation of
the element name.
What is the ATOMIC WEIGHT?
o
The number of protons
and neutrons in the
nucleus of an atom.
What is an ELEMENT?
o
A substance
composed of a
single kind of atom.
o
Cannot be broken
down into another
substance by
chemical or physical
means.
What is a COMPOUND?
o
A substance in
which two or
more different
elements are
CHEMICALLY
bonded together.
Radioactive Isotopes
 Changing
the
number of
neutrons can
affect stability of
the nucleus
Compound
 Elements
combine to form
complex
substances.
 NaCl
Na vs NaCl
 Na
Lanthanides Demo…
 They
are
luminescent!
Igniting Elements
 Lithium
turns
flame different
color!