How Atoms Differ Chp 4.

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Presentation transcript:

How Atoms Differ Chp 4

Element # protons # electrons # neutrons Atomic number Pb 8 30

Element # protons # electrons # neutrons Atomic number Pb 82 125 O 8 Zn 30 35

Dalton was incorrect 1. Subatomic particles exist (atoms ARE divisible ). 2. Isotopes exist (atoms of an element ARE NOT identical). Atoms with the same number of protons (and electrons) but different number of neutrons are called isotopes.

C carbon-13 Atomic mass-number of protons and neutrons for the isotope 6 carbon-13 Atomic number-number of protons for the isotope Name of the isotope. Includes the mass number

Isotope Element Atomic number Mass number Neon 10 22 Ne 22 10 Neon-22

Making life easier! 1 amu= 1/12th the mass of a carbon-12 atom. 1 amu =1 proton or neutron.

The atomic mass is the weighted average mass of isotopes of that element. not a whole number?! Natural percent abundance-the percentage that isotopes naturally occur in the environment. These percentages are used to calculate the weighted average of isotopes present in the environment.

Calculate the Student’s final grade-a weighted average A=4.0, B=3.0, and C=2.0 B-Term Paper?(20% of grade) C-Midterm exam (30% of grade) B-Final Exam?(50% of grade)

Calculate the Atomic Weight for this isotope. Chlorine-35  amu=34.969   Percent Abund.=75.78% Chlorine-37  amu=36.966   Percent Abund. =24.22%

Calculate the atomic mass of unknown element X Calculate the atomic mass of unknown element X. Identify the unknown element. Isotope X-6 ? 6.015 amu 7.59% Isotope X-7 ? 7.016 amu

Nitrogen has two naturally occuring isotopes Nitrogen has two naturally occuring isotopes. Nitrogen-14 and Nitrogen-15. Its atomic mass is 14.007 amu. Which isotope of nitrogen is more abundant? Explain your answer.

Answers: 2.7 is a C 35.45 amu 6.94 amu is Lithium Nitrogen-14 because its atomic mass is closest to the weighted average.