Isotopes & Average Atomic Mass

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

Front

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

Back

Average atomic mass is calculated by multiplying the mass of each isotope by its relative abundance (as a decimal), then summing these values.

Front

What is the average atomic mass of an element with isotopes of 4 amu (30%), 5 amu (20%), and 3 amu (50%)?

Back

4 amu.

Front

What is the correct symbol for Fluorine-18?

Back

The correct symbol is 18F.

Front

How many neutrons are in an atom of Nitrogen-16?

Back

9 neutrons.

Front

What are isotopes of the same element?

Back

Isotopes of the same element have the same atomic number (number of protons) but different mass numbers due to varying numbers of neutrons.

Front

Which isotopes of lead are mentioned?

Back

Lead-204, Lead-206, Lead-207, Lead-208.

Front

What is the average atomic mass of lead?

Back

The average atomic mass of lead is 207.2.

Front

Which isotope of lead is likely to be the most abundant?

Back

Lead-207.

Front

What does the mass number of an isotope represent?

Back

The mass number represents the total number of protons and neutrons in the nucleus of an atom.