Questions and Answers
What do isotopes of an element have in common, and how do they differ?
They have the same atomic number (protons) but a different number of neutrons, causing the isotopes to have different atomic masses.
What is the atomic number and the atomic mass number of the isotope 12C6?
Atomic number: 6, Atomic mass: 12
Write the atomic symbols for nitrogen-14 and nitrogen-15.
14N7, 15N7
If two atoms contain the same number of neutrons, can we determine they are the same element? Explain.
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Do you think most fluorine atoms have 9 neutrons or 10 neutrons? Explain.
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What is the average atomic mass of mercury, Hg, according to the provided isotopic data?
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What is the average atomic mass of oxygen, O, according to the provided isotopic data?
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Study Notes
Isotopes Overview
- Isotopes of the same element share the same atomic number (number of protons) but differ in the number of neutrons, resulting in different atomic masses.
Carbon Isotope Example
- Carbon-12 (12C6) has an atomic number of 6 and an atomic mass of 12.
Nitrogen Isotopes
- Nitrogen-14 can be represented as 14N7.
- Nitrogen-15 is represented as 15N7.
Neutron Count and Elements
- Having the same number of neutrons does not confirm that two atoms are the same element, as different elements can have identical neutron counts.
Fluorine Atom Neutrons
- The average mass of fluorine atoms is 18.998 u; most contain 10 neutrons, consistent with fluorine's atomic number being close to 19 u.
Average Atomic Mass of Mercury
- The average atomic mass of mercury (Hg) is calculated to be 200.592 u based on the given isotopic abundances and atomic masses of its isotopes.
Average Atomic Mass of Oxygen
- The average atomic mass of oxygen (O) is determined to be 15.999 u, primarily influenced by the abundance of the O-16 isotope (99.75%).
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Description
Test your knowledge of isotopes with these flashcards. Discover how isotopes of an element share the same atomic number but differ in neutron count and atomic mass. Perfect for students studying chemistry and atomic structure.
