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# Mastering Weighted Averages and Atomic Weight Calculations Quiz

Test your knowledge on weighted averages and atomic weight calculations with this quiz! Learn how to determine the meaning of atomic weight using hydrogen isotopes as a theoretical example. Put your skills to the test and calculate the weighted average in this interactive quiz.

Created by
@AccomplishedBixbite

## Questions and Answers

### Define atomic mass, atomic number, and atomic weight.

Atomic mass is the average mass of all the different forms of an element that exist on the planet. Atomic number is the number of protons found in an atom. Atomic weight is the weighted average of all naturally occurring isotopes of an element.

### How is average atomic mass calculated?

Average atomic mass of an element is calculated by considering the weighted average of all naturally occurring isotopes of an element. It is found by multiplying the mass number of each isotope by its percent abundance, and then summing up these values.

### What does the atomic number represent?

The atomic number represents the number of protons found in an atom. It is also the most critical piece of information that exists about an atom.

### Can the atomic number of an element change?

<p>No, the atomic number of an element will never change. It is always equal to the number of protons in the atom.</p> Signup and view all the answers

### What is the mass of the most common isotope of hydrogen?

<p>1 amu</p> Signup and view all the answers

### What is the mass of the deuterium isotope of hydrogen?

<p>2 amu</p> Signup and view all the answers

### What is the mass of the tritium isotope of hydrogen?

<p>3 amu</p> Signup and view all the answers

### What is the atomic weight of hydrogen?

<p>1.0079 amu</p> Signup and view all the answers

### What is the average atomic mass (atomic weight) on the periodic table based on?

<p>The relative abundances of each isotope of that element.</p> Signup and view all the answers

### What is the atomic weight of hydrogen on the periodic table?

<p>Very close to 1 or 1.0079 amu.</p> Signup and view all the answers

### What is the atomic weight of lithium on the periodic table?

<p>6.941 amu.</p> Signup and view all the answers

### Which lithium isotope is likely to be more common in nature?

<p>Lithium-7.</p> Signup and view all the answers

### What is the mass number of an atom?

<p>The mass number of an atom is found by adding the number of protons and the number of neutrons in that atom.</p> Signup and view all the answers

### What is the formula for calculating atomic mass?

<p>Atomic mass is defined as the weighted average of all of the naturally occurring isotopes of an element.</p> Signup and view all the answers

### What is an isotope?

<p>Isotopes are atoms of the same element that have a different number of neutrons in their nucleus.</p> Signup and view all the answers

### How is atomic mass different from atomic weight?

<p>Atomic mass and atomic weight are terms that are often used interchangeably and have no discernible difference in their definitions.</p> Signup and view all the answers

### What is the formula for calculating the atomic weight of an element?

<p>The formula for calculating the atomic weight of an element is obtained by multiplying each percent abundance by the corresponding mass number and then adding up the resulting products.</p> Signup and view all the answers

### What is an isotope of an element?

<p>An isotope of an element is a different form of an atom that exists with varying numbers of neutrons.</p> Signup and view all the answers

### What is the average atomic mass?

<p>The average atomic mass is the weighted average of the masses of all the isotopes of a particular element, taking into consideration the percent abundance of each naturally occurring isotope.</p> Signup and view all the answers

### What is the mass of a hydrogen atom?

<p>The mass of a hydrogen atom depends on the isotope. The most common isotope, protium, has a mass of about 1 amu. Deuterium has a mass of about 2 amu, and tritium has a mass of about 3 amu.</p> Signup and view all the answers

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