Date post: | 23-Dec-2015 |
Category: |
Documents |
Upload: | irma-harrison |
View: | 218 times |
Download: | 0 times |
Isotopes All atoms of an element have the same
number of protons.However, they can have a different number of neutrons. What do we call
an atom when they have the same # of protons, but a different # of neutrons?
ISOTOPESLets Explore Isotopes…
This nucleus is NOT an isotope because there are the same # of
protons & neutrons.
KEY:Green = ProtonsRed = Neutrons
ISOTOPE!There are a different # of protons &
neutrons. Let’s get a closer look…
They are still the same element. They are just a little different from every other atom of the same element.
If an atom has a MISSING neutron or an EXTRA neutron:ISOTOPE!
HYDROGEN
1 proton & 1 neutron = Hydrogen isotope1 proton & 2 neutrons = Hydrogen isotope
•Hydrogen has 1 proton. THIS WILL NEVER CHANGE! (If there are 2 protons, it isn’t hydrogen!)
•Most Hydrogen have no neutrons.
**The “1 proton” tells us it is hydrogen. Having neutrons tells us it is an isotope.**
Carbon
In nature, ALL carbon have 6 protons. Most carbon have 6 neutrons.
6 proton + 6 neutron
6 proton + 7 neutron
6 proton + 12 neutron
FIND THE ISOTOPE(S)…
Carbon
In nature, ALL carbon have 6 protons. Most carbon have 6 neutrons.
6 proton + 6 neutron
6 proton + 7 neutron
6 proton + 12 neutron
WHY ARE THEY ISOTOPES?
In nature, ALL carbon have 6 protons. Most carbon have 6 neutrons.
6 proton + 6 neutron
6 proton + 7 neutron
6 proton + 12 neutron
Because they have a different # of neutrons then what normally happens in nature.
How are we supposed to know what normally happens in
nature???Excellent question. Let’s go over how to read one
element box on the Periodic Table of Elements.
Element Name
Atomic Number (# of protons)
Element Symbol
Mass Number(sometimes called
Atomic Mass)
You know how to find the number of neutrons…
Subtract the # of protons from the Mass Number (rounded).
12 – 6 = 6 Neutrons
So, 6 protons & 6 neutrons are the
“normal” amounts of each found in nature.
Carbon:6 protons6 neutronsMass=12
CarbonISOTOPE:
6 protons8 neutronsMass=14
How do I know if it is a “regular” element or an isotope??
1. Use the Periodic Table of Elements as your baseline.
2. Calculate # neutrons for the element. (Mass – Protons = Neutrons)
3. Then look to see if your Element has more neutrons than the same element on the Periodic
Table.4. That’s it! If it has LESS or MORE neutrons –
ISOTOPE!
Carbon on the Periodic Table has a Mass Number of 12
and 6 protons.
Which one of these are ISOTOPES?
Carbon on the Periodic Table has a Mass Number
of 12 and 6 protons.12 – 6 = 6 Neutrons
ISOTOPES
13 – 6 = 7 Neutrons
14 – 6 = 8 Neutrons
This is a REALLY easy concept. If an element has more or less neutrons than
the same element on the periodic chart – ISOTOPE.
Questions? Ask Mrs. Cancel or another student
to help clarify.