chem chapter 1 (isotopes, atomic weight, molar mass)

A set of vocabulary flashcards covering isotopes, carbon-12/13, atomic weight, molar mass, isotopic abundances, and related concepts as discussed in the notes.

Isotope

An atom of the same element that has a different number of neutrons, resulting in a different mass (e.g., carbon-12 and carbon-13).

Carbon-12

An isotope of carbon with mass number 12 (6 protons, 6 neutrons).

Carbon-13

An isotope of carbon with mass number 13 (6 protons, 7 neutrons).

Atomic weight

The weighted average mass of an element's isotopes, calculated from each isotope's mass and its natural abundance.

Isotopic abundance

The percentage of a particular isotope found in a natural sample.

One mole

The amount of substance containing Avogadro's number of entities (6.022 × 10^23).

Molar mass

The mass of one mole of a substance; numerically equal to the element's atomic weight.

Weighted average calculation

Process of summing (isotope mass × abundance) for all isotopes to obtain atomic weight.

Product table (isotope masses)

A reference table listing isotopic masses (and abundances) used to compute atomic weights.