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 determine the number of neutrons in an isotope?

Back

To find the number of neutrons, subtract the atomic number (number of protons) from the mass number (total number of protons and neutrons).

Front

What is the mass number of an isotope?

Back

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

Front

If an element has an atomic number of 6, how many protons does it have?

Back

It has 6 protons.

Front

What is the average atomic mass?

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 many neutrons are in Carbon-12?

Back

Carbon-12 has 6 neutrons.

Front

Which of the following represents isotopes of the same element: I. 77_35X II. 77_33X III. 81_37X IV. 81_35X?

Back

I and IV represent isotopes of the same element.

Front

How many neutrons are in Nitrogen-16?

Back

Nitrogen-16 has 9 neutrons.

Front

What is the average atomic mass of an element with isotopes of 35.00 amu, 36.00 amu, and 38.00 amu?

Back

It is impossible to tell without knowing the relative abundances of the isotopes.

Front

How many neutrons are in Carbon-13?

Back

Carbon-13 has 7 neutrons.