ISOTOPES AND ATOMIC MASS

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Presentation transcript:

ISOTOPES AND ATOMIC MASS Chem-To-Go Lesson 6 Unit 2

Quick review PROTON NEUTRON ELECTRON Has mass Found in the nucleus Has no mass Found outside the nucleus

Why are all three atoms considered to be hydrogen? Isotope illustration 𝟏 𝟏 𝐇 𝟏 𝟐 𝐇 𝟏 𝟑 𝐇 Hydrogen-1 Hydrogen-2 Hydrogen-3 Why are all three atoms considered to be hydrogen? Definition of Isotope: Atoms of the same element that have different masses because of differing numbers of neutrons (therefore different mass numbers)

Prevalence of isotopes All of these blocks are called Legos, but they are not all identical to one another. Most elements have several isotopes.

Atomic Mass If there are THREE different types of magnesium atoms, which ONE is represented on the periodic table? Answer: None! The block represents the average magnesium atom. Huh? No magnesium atom actually weighs 24.3050 amu. All of the different types of magnesium atoms were averaged, and an average Mg atom weighs 24.3050 amu.

Calculating atomic mass Atomic Mass = [(decimal abundance)(mass)] + [(decimal abundance)(mass)] + [(decimal abundance)(mass)] + …

Calculating atomic mass Atomic Mass = [(decimal abundance)(mass)] + [(decimal abundance)(mass)] + [(decimal abundance)(mass)] + …