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Copy of Ions and Isotopes

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by

Allison Carlson

on 15 November 2016

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Transcript of Copy of Ions and Isotopes

What happens if the number of
protons
and
electrons
is not the same???
Ions and Isotopes
You no longer have an atom~~you have an ion.
Ions

are formed when an atom
loses
or
gains
one or more electrons.
This often occurs during a
chemical reaction
when compounds are formed.
Ions
How to write an ion
If you have a negative Ion it is written with a negative sign following the element symbol.

Ex: Oxygen =
O
We call these
Anions

-
If it is positive it looks like this
Ex:
O
We call these
Cations
+
Remember in an ion if you are adding electrons you are making an atom
NEGATIVE!
So what is an isotope?
Atoms of the same
element
can have different numbers of
neutrons
.
This creates different versions of that
element.
For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons.
Hydrogen
Deuterium
Tritium
How many isotopes can one element have? Can an atom have just any number of neutrons?
No
; there are "preferred" combinations of neutrons and protons, at which the forces holding nuclei together seem to balance best. Light elements tend to have about as many neutrons as protons; heavy elements apparently need more neutrons than protons in order to stick together. Atoms with a few too many neutrons, or not quite enough, can sometimes exist for a while, but they're
unstable and decay quickly
.
I'm not sure what you mean by "unstable." Do atoms just fall apart if they don't have the right number of neutrons?
Well, yes, in a way. Unstable atoms are radioactive: their nuclei change or decay by
spitting out radiation,
in the form of particles or electromagnetic waves.
Other examples of Isotopes....
Review!
Now lets review and practice!
How do you write out isotopes?
There are several ways to write isotopic symbols:
- The most common way is
Carbon-12
Carbon-13
- Another way includes
C

-Lastly
C

12
6
12
6
Full transcript