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Atoms have charges. There are two kinds of
charges. There are positive (+) charges and negative (-)
charges. Scientists have discovered that some parts of an atom have
positive charges and other parts have negative charges.
PROTONS - have positive charges (+)
ELECTRONS - have negative charges (-)
NEUTRONS - have no charges. They
are neutral.
An atom has the same number of protons and
electrons. Notice on the diagram below there are 2 protons and
2 electrons.
The number of neutrons and protons of an
atom is called its atomic weight (mass).
Each PROTON is given a weight of one.
Each NEUTRON is given a weight of one.
Here's an example:
|
Name of Element |
Number of Protons |
Number of Neutrons |
Atomic Weigh |
|
cobalt |
27 |
32 |
59 |
Practice finding the atomic weight of each
of the elements listed below. Remember the atomic weight equals the
sum of the protons and neutrons.
Directions: Answer the questions about atomic
weight.
A
has a positive charge.
An
has a negative charge.
A
has no charge.
The number of
and protons of an atom is called its atomic weight (mass).
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