Fall Semester Exam Review

Front

What is the average atomic mass of an element?

Back

The average atomic mass is the weighted average of the masses of an element's isotopes, taking into account their relative abundances.

Front

How do you calculate the average atomic mass of an element with multiple isotopes?

Back

Multiply the mass of each isotope by its relative abundance (as a decimal), then sum these values.

Front

What is the formula for calculating average atomic mass?

Back

Average Atomic Mass = (mass of isotope 1 × abundance of isotope 1) + (mass of isotope 2 × abundance of isotope 2) + ...

Front

Who is known for organizing the periodic table by atomic mass?

Back

Dmitri Mendeleev is known for organizing the periodic table by atomic mass.

Front

What is the significance of the gold foil experiment?

Back

The gold foil experiment conducted by Ernest Rutherford demonstrated that atoms have a small, dense, positively charged nucleus.

Front

What is shorthand electron configuration?

Back

Shorthand electron configuration is a method of representing the distribution of electrons in an atom using the nearest noble gas as a reference.

Front

What is the shorthand electron configuration for Sulfur?

Back

[Ne] 3s² 3p⁴

Front

What is the role of isotopes in calculating average atomic mass?

Back

Isotopes are variants of an element with different numbers of neutrons, and their relative abundances are used to calculate the average atomic mass.

Front

What is the atomic mass unit (amu)?

Back

The atomic mass unit (amu) is a standard unit of mass that quantifies mass on an atomic or molecular scale, defined as one twelfth of the mass of a carbon-12 atom.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average of an element's isotopes, while mass number is the total number of protons and neutrons in an atom's nucleus.