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 mass numbers.

Front

What is the symbol for Fluorine-18?

Back

The symbol for Fluorine-18 is ¹⁸F.

Front

How many neutrons are in Carbon-13?

Back

Carbon-13 has 7 neutrons.

Front

What is the atomic mass of an element?

Back

The atomic mass of an element is the weighted average of the masses of the isotopes of the element.

Front

Which two symbols represent isotopes of the same element? I. ⁷⁷₃₅X II. ⁷⁷₃₃X III. ⁸¹₃₇X IV. ⁸¹₃₅X

Back

I and IV represent isotopes of the same element.

Front

How do you calculate average atomic mass?

Back

Average atomic mass is calculated by multiplying the mass of each isotope by its relative abundance (as a decimal) and summing the results.

Front

What is the mass number of an isotope?

Back

The mass number of an isotope is the total number of protons and neutrons in its nucleus.

Front

If an element has an atomic number of 6, what is its identity?

Back

The element with an atomic number of 6 is Carbon.

Front

What is the difference between atomic mass and mass number?

Back

Atomic mass is the weighted average of all isotopes of an element, while mass number is the total count of protons and neutrons in a specific isotope.

Front

What is the average atomic mass of an isotope with 30% at 4 amu, 20% at 5 amu, and 50% at 3 amu?

Back

The average atomic mass will be closest to 4 amu.