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Chapter 3 Isotopes

Chapter 3 Isotopes. Part II. Atoms. Nucleus is center core. Nucleus is made of Protons & Neutrons. Electrons orbit the nucleus. Atomic Number. The Atomic Number is the number of protons found in the nucleus. All atoms of an element have the same Atomic Number. Mass Number.

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Chapter 3 Isotopes

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  1. Chapter 3Isotopes Part II

  2. Atoms • Nucleus is center core. • Nucleus is made of Protons & Neutrons. • Electrons orbit the nucleus.

  3. Atomic Number • The Atomic Number is the number of protons found in the nucleus. • All atoms of an element have the same Atomic Number

  4. Mass Number • Mass number is the number of neutrons and protons in the nucleus. • This number is not always the same for all atoms in an element.

  5. Isotopes

  6. Isotopes • Isotopes of an element have the same number of protons but different numbers of neutrons. • The charge is the same, but they have a different mass.

  7. But how it that different from Atomic Mass? • Atomic mass takes into account the relative abundance of each isotope. • The weight of atoms are measured in amu’s

  8. What is an amu? • Amu is Atomic Mass Unit. • It is defined as 1/12th of the mass of a Carbon-12 atom.

  9. Relative abundance • Most elements have one isotope that is the majority share of the element.

  10. Calculating the Atomic Mass from the sum of the isotopes. • The atomic mass takes the natural abundance into consideration. • Assume the sample is 1 gram. • 99.985% of 1.007825035 is 1.007673861 • 0.015% of 2.014101779 is 3.02115 x10-4 • The sum of these is the atomic mass: • 1.007975976 amu

  11. Worksheet

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