Isotopes

Front

What are isotopes?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons.

Front

How do isotopes of an element differ?

Back

Isotopes differ in the number of neutrons they contain.

Front

What is the significance of the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, reflecting the relative abundance of each isotope.

Front

What is the notation for isotopes?

Back

Isotopes are often represented as 'Element-Mass Number', e.g., Carbon-14 is written as 14C.

Front

How many neutrons are in Potassium-39?

Back

Potassium-39 has 20 neutrons.

Front

What is the atomic mass of copper based on its isotopes?

Back

The atomic mass of copper, based on its isotopes, is approximately 64.4 amu.

Front

If an element has 12 protons and 13 neutrons, what is its isotope?

Back

The isotope is Magnesium-25 (Mg-25).

Front

What is the relationship between protons, neutrons, and atomic mass?

Back

The atomic mass of an element is approximately equal to the sum of its protons and neutrons.

Front

What is the difference between Fluorine-9 and Fluorine-18?

Back

Fluorine-9 has 9 protons and 0 neutrons, while Fluorine-18 has 9 protons and 9 neutrons.

Front

How do you calculate the atomic mass from isotopic abundance?

Back

Multiply the mass of each isotope by its relative abundance (as a decimal) and sum the results.