Miscellaneous
Isotopes
Atomic
Mass
Atomic Structure
Review
100

What are the units for atomic mass?

What is amu (atomic mass units)

100

Define isotope.

Atoms that are the same element but different mass. 

100

What trick can you use to check your work after
 calculating average atomic mass?

Check to see if you answer is between the lowest mass and highest mass of the isotopes OR check the periodic table. 

100

Which subatomic particle(s) are found in the nucleus of the atom? 

protons and neutrons

100
What are the charges on protons, neutrons, and electrons?
Protons are Positive+, Neutrons are Neutral (0), and Electrons are Negative (-)
200

Define relative abundance.

What is: The level that each isotope appears naturally in nature.

200

Name 3 ways that isotopes are different from each other. 

Number of neutrons, mass number, atomic mass. 

200

Carbon-12 has an abundance of 98.9% and C-13 has an abundance of 1.1%. What is the average atomic mass of Carbon?

Around 12.011 amu (atomic mass units)

200

Which subatomic particle(s) orbit the nucleus? 

Electrons

200

You travel on a spaceship to a far off planet and measure the atomic mass of a Potassium atom (K). What would you expect it to be?

It would be around 39 atomic mass units. The mass of a Potassium atom is the same everywhere! (so long as it is not an isotope of Potassium other than K-39).

300

Define average atomic mass. 

The weighted average of all of the isotope masses multiplied by the relative abundance of each isotope. 
300

Name 3 things that isotopes have in common. 

Element, number of protons, atomic number. 

300
Chlorine-35 has an abundance of 75.77% in the atmosphere and Chlorine-37 has an abundance of 24.23%. What is the average atomic mass of Chlorine?
Around 35.48 amu.
300

Which subatomic particle has a mass that is about equal to the mass of a proton? 

neutron

300

How many protons are in an atom with -1 overall charge and 3 electrons? 

2 protons

400

How many neutrons are in Potassium-40? (K-40?)

21

400

How many neutrons are in C-12, C-13, and C-14, respectively?

6, 7, and 8

400
Neon-20 has an abundance of 90.48% in the atmosphere, Neon-21 has an abundance of 0.27% and Neon-22 has an abundance of 9.25%. What is the average atomic mass of Neon?
Around 20.1877
400

What is the mass number of an atom with 12 protons and 13 neutrons? 

25
400

Which scientist discovered neutrons? 

Chadwick

500

How many neutrons are in an atom with 12 electrons, neutral charge, and a mass number of 24?

12

500

Will the average atomic mass of Carbon be closest to the mass of Carbon-12, C-13, or C-14? Explain how you know. 

C-12: 99% abundant

C-13: 1% abundant

C-14: <1% abundnant

The mass will be closest to the mass of c-12 (12) because C-12 has the highest relative abundance. 

500

Oxygen-16 has an abundance of 99.76% in the atmosphere and Oxygen-18 has an abundance of 0.201%. Would you expect the average atomic mass of Oxygen to be closer to 16amu or 18amu? Why?

Because 99.76% of the Oxygen in the atmosphere is Oxygen-16, I would expect the average atomic mass to be closer to 16 amu.

500

Draw a carbon atom with neutral charge. 

Draw on the board. 

500

Which scientist discovered the electrons orbit the nucleus? 

Bohr

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