1) What is the mass number for this isotope of lithium if it has 3 protons and 4 neutrons? a) 3 b) 4 c) 7 d) 1 2) How many neutrons does this isotope of potassium have if it has 19 protons and a mass number of 40? a) 19 b) 40 c) 21 d) 59 3) What does the "A" represent in this picture? a) mass number (protons + neutrons) b) atomic number (just protons) c) number of electrons d) the element symbol 4) What does the "Z" represent in this picture? a) mass number (protons + neutrons) b) atomic number (just protons) c) number of electrons d) the element symbol 5) What does the "X" represent in this picture? a) mass number (protons + neutrons) b) atomic number (just protons) c) number of electrons d) the element symbol 6) What does the "88" represent in this isotope of strontium? a) mass number (protons + neutrons) b) number of electrons c) atomic number (just protons) d) the element symbol 7) How many protons would this isotope of strontium have? a) 88 b) 38 c) 50 d) 126 8) How many neutrons would this isotope of strontium have? (neutrons = mass # - protons) a) 88 b) 38 c) 50 d) 126 9) If you change the number of neutrons, does the element identity change? a) yes b) no 10) If you change the number of protons, does the element identity change? a) yes b) no

IPC: Isotopes

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