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!.

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Isotope Quiz

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Isotope quiz

Isotope Quiz

Top Questions Missed


1 difficulty finding the number of protons

#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

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

#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

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

#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

#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

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

#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

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.


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