# Isotope Quiz - PowerPoint PPT Presentation

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Isotope Quiz. Top Questions Missed. #1 Difficulty: Finding the number of protons. You need to know: Atomic NUMBER is the number of P_____________________ Protons! Atomic MASS is two things added together: P_________ & N__________ Protons and neutrons!.

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Isotope Quiz

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## Isotope Quiz

Top Questions Missed

### #1 Difficulty: Finding the number of protons

• You need to know:

• Atomic NUMBER is the number of P_____________________

• Protons!

• Atomic MASS is two things added together: P_________ & N__________

• Protons and neutrons!

### Let’s try finding the number of protons:

• In a nitrogen atom with a mass number of 14 and an atomic number of 7, the number of protons is

• 7 (the atomic number is the number of protons)

• In a sodium atom with a mass number of 23 and an atomic number of 11, the number of protons is

• 11 (the atomic number is the number of protons)

### #2 Difficulty: Finding the atomic mass

• You need to know:

• Atomic NUMBER is the number of P_____________________

• Protons!

• Atomic MASS is two things added together: P_________ & N__________

• Protons and neutrons!

### Let’s try finding the atomic mass:

• In a nitrogen atom with a mass number of 7 neutrons and an atomic number of 7, the atomic mass is

• 14 (the atomic mass is the number of protons and neutrons added together)

• In a sodium atom with 12 neutrons and an atomic number of 11, the atomic mass is

• 23 (the atomic mass is the number of protons and neutrons added together)

### #3 Difficulty: the particle found in all atoms

• You need to know:

• The periodic table has a pattern of increasing protons

• Therefore, all atoms on the periodic table must have protons

### #4 Difficulty: finding which isotope is the most abundant

• You need to know:

• The average atomic mass listed on the periodic table is the average mass of all the known isotopes of an element

• You round the average atomic mass to the nearest whole number to find the most common isotope.

• Rounding refresher:

• If the number in the tenths place is less than 5, you round down (23.4 would be rounded down to 23 because 4 is less than 5)

• If the number in the tenths place is 5 or more, you round up (23.5 would be rounded up to 24 because it is 5 or more)

• For example, on the periodic table the average atomic mass of nickel is 58.69. The most common isotope of nickel is nickel 59.

### Let’s find the most abundant isotopes:

• Potassium has an average atomic mass of 39.30. What is the most common isotope?

• Potassium-39

• Chlorine has an average atomic mass of 35.34. What is the most common isotope?

• Chlorine-35

• Copper has an average atomic mass of 63.55. What is the most common isotope?

• Copper-64

### #5 Difficulty: Determining an electron from pictures

• You need to know:

• In a 0 charged atom, the number of electrons is the same as the number of protons

• You can look up the name of an element using the periodic table if you know the number of protons

• You need to know which parts represent the electrons in the picture

An element with 4 protons is called Beryllium

### Quiz Correction Directions:

• Take out a piece of blank paper.

• Write your name and period # on the top.

• Write out 3 questions you missed.

• Answer the 3 questions correctly.

• Attach the quiz results to the corrections and place it in the inbox.

• Return the quiz to Mrs. Bertoson.