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.

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Presentation transcript:

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? ISOTOPES Lets Explore Isotopes…

There are a different # of protons & neutrons. KEY: Green = Protons Red = Neutrons This nucleus is NOT an isotope because there are the same # of protons & neutrons. ISOTOPE! There are a different # of protons & neutrons. Let’s get a closer look…

If an atom has a MISSING neutron or an EXTRA neutron: ISOTOPE! They are still the same element. They are just a little different from every other atom of the same element.

HYDROGEN Hydrogen has 1 proton. THIS WILL NEVER CHANGE! (If there are 2 protons, it isn’t hydrogen!) Most Hydrogen have no neutrons. 1 proton & 1 neutron = Hydrogen isotope 1 proton & 2 neutrons = Hydrogen isotope **The “1 proton” tells us it is hydrogen. Having neutrons tells us it is an isotope.**

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 FIND THE ISOTOPE(S)…

Carbon 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 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.

(sometimes called Atomic Mass) 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 ISOTOPE: 6 protons 8 neutrons Mass=14 Carbon: 6 protons 6 neutrons Mass=12

How do I know if it is a “regular” element or an isotope?? Use the Periodic Table of Elements as your baseline. Calculate # neutrons for the element. (Mass – Protons = Neutrons) Then look to see if your Element has more neutrons than the same element on the Periodic Table. 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 13 – 6 = 7 Neutrons ISOTOPES 14 – 6 = 8 Neutrons

Questions? Ask Mrs. Cancel or another student to help clarify. 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.