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Exceptions to the Rule… For each given element, the number of protons is ALWAYS the same – If you change the number of protons, you are now working with.

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Presentation on theme: "Exceptions to the Rule… For each given element, the number of protons is ALWAYS the same – If you change the number of protons, you are now working with."— Presentation transcript:

1 Exceptions to the Rule… For each given element, the number of protons is ALWAYS the same – If you change the number of protons, you are now working with a different element Each element can have a different number of neutrons or a different number of electrons, but it will still be the same element – A different number of electrons is called an ion – A different number of neutrons is called an isotope

2 Isotopes If the number of neutrons is different, it will have a different atomic mass number – For example carbon can have a mass of 12 (usually) or 13 (rarely, but still exists) – Hydrogen has three isotopes, Hydrogen 1 (called Hydrogen), Hydrogen 2 (Deuterium), or Hydrogen 3 (Tritium)

3 Here are three isotopes of an element: 6 12 C 6 13 C 6 14 C The element is: __________________ The number 6 refers to the _________________________ The numbers 12, 13, and 14 refer to the ________________________ How many protons and neutrons are in the first isotope? _________________ How many protons and neutrons are in the second isotope? _________________ How many protons and neutrons are in the third isotope? _________________

4 Isotope name atomic # mass # # of protons # of neutrons # of electrons 92 uranium uranium boron-10 5 boron-11

5 ASSESSMENT TIME! Elements – names / symbols Classifying Matter - Pure Substances / Mixtures Atomic Structure – Protons, Neutrons, Electrons, neutral atoms,

6 Ions When an element has no charge, its number of protons (positive) is equal to its number of electrons (negative) When it has a charge, called an Ion, it has a different number of electrons (remember, the number of protons can not change) – Fluorine, neutral is 9 protons and 9 electrons – Fluoride ion, -1 charge is 9 protons and 10 electrons – Sodium, neutral is 11 protons and 11 electrons – Sodium ion, +1 is 11 protons and 10 electrons


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