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Isotope Quiz

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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  1. Isotope Quiz Top Questions Missed

  2. #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!

  3. 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)

  4. #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!

  5. 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)

  6. #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

  7. #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.

  8. 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

  9. #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

  10. 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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