Daily Quiz:

Daily Quiz:

1. An atom of beryllium has how many protons?

A. 4

B. 5

C. 9

D. 13

Daily Quiz:

2. An atom of bromine has how many neutrons?

A. 35

B. 45

C. 80

D. 115

Daily Quiz:

3. An isotope of uranium has 92 electrons and 144 neutrons. What is the mass number of this isotope?

A. 92

B. 144

C. 236

D. 238.029

4. Element X has two naturally occurring isotopes, 14X and 15X. 14X, abundance = 99.63%15X, abundance = 0.37%

Element X is:

A. Boron

B. Carbon

C. Nitrogen

D. Oxygen

Daily Quiz:

1. An atom of beryllium has how many protons?

A. 4

B. 5

C. 9

D. 13

Daily Quiz:

1. An atom of beryllium has how many protons?

A. 4

B. 5

C. 9

D. 13

Daily Quiz:

2. An atom of bromine has how many neutrons?

A. 35

B. 45

C. 80

D. 115

Daily Quiz:

2. An atom of bromine has how many neutrons?

A. 35

B. 45

C. 80

D. 115

Daily Quiz:

3. An isotope of uranium has 92 electrons and 144 neutrons. What is the mass number of this isotope?

A. 92

B. 144

C. 236

D. 238.029

Daily Quiz:

3. An isotope of uranium has 92 electrons and 144 neutrons. What is the mass number of this isotope?

A. 92

B. 144

C. 236

D. 238.029

4. Element X has two naturally occurring isotopes, 14X and 15X. 14X, abundance = 99.63%15X, abundance = 0.37%

Element X is:

A. Boron

B. Carbon

C. Nitrogen

D. Oxygen

4. Element X has two naturally occurring isotopes, 14X and 15X. 14X, abundance = 99.63%15X, abundance = 0.37%

Element X is:

A. Boron

B. Carbon

C. Nitrogen

D. Oxygen

Modeling Isotopes

Modeling Isotopes

Modeling Isotopes

Some pennies are

made of copper.

Modeling Isotopes

Some are made of zinc.

Modeling Isotopes

There was also one year when they were made from steel.

These are rare. We probably won’t see any of these today.

Modeling Isotopes

The change from copper

to zinc happened in 1982.

Modeling Isotopes

Pre- and post-1982 pennies can be used to model an element with two naturally occurring isotopes.

Modeling Isotopes

There are three parts to this lab.

Modeling Isotopes

There are three parts to this lab.

1.Find the average mass of a copper penny and of a zinc penny.

Modeling Isotopes

There are three parts to this lab.

2. Use mass × abundance to find an “atomic mass” for your sample of pennies.

Modeling Isotopes

There are three parts to this lab.

Then trade samples

with another group!

Modeling Isotopes

There are three parts to this lab.

3. Use “atomic mass” to predict the abundance of zinc and copper pennies in your new sample.

Modeling Isotopes

There are three parts to this lab.

At the end, compare your predictions with

the other group’s measurements.