Isotopes and Calculating 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 does the 'A' in the isotope symbol represent?

Back

The 'A' represents the mass number, which is the total number of protons and neutrons in the nucleus of an atom.

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 atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

If an isotope has 22 protons, what element is it?

Back

It is titanium (Ti), as titanium has an atomic number of 22.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is the mass number of an atom with 10 protons and 12 neutrons?

Back

The mass number is 22 (10 protons + 12 neutrons).

Front

Which isotope of lead is most abundant if the average atomic mass is 207.2?

Back

Lead-207 is likely the most abundant isotope.

Front

What is the significance of the average atomic mass?

Back

The average atomic mass reflects the weighted average of all isotopes of an element based on their natural abundance.

Front

How do isotopes affect the atomic mass of an element?

Back

Isotopes with different masses contribute to the average atomic mass based on their relative abundances.