1) Magnesium has a mass number of 25, how many neutrons does it have? a) 12 b) 24 c) 13 d) 25 2) Beryllium has a mass number of 9, how many neutrons does it have? a) 4 b) 9 c) 5 d) 14 3) Iron has an mass number of 56, how many neutrons does it have? a) 26 b) 56 c) 30 d) 82 4) Titanium has a mass number of 48. How many neutrons does it have? a) 26 b) 48 c) 22 d) 70 5) Nitrogen has a mass number of 14. How many neutrons does it have? a) 7 b) 14 c) 21 d) 28 6) Phosphorous has a mass number of 31. How many neutrons does it have? a) 31 b) 15 c) 16 d) 46 7) Krypton has a mass number of 84. How many neutrons does it have? a) 19 b) 84 c) 36 d) 48 8) Strontium has a mass number of 88. How many neutrons does it have? a) 50 b) 88 c) 38 d) 138 9) An atom with 10 protons, 10 electrons and 11 neutrons will have a mass number of... a) 10 b) 21 c) 11 d) 32 10) An ion with 4 protons, 2 electrons and 3 neutrons will have a mass number of... a) 2 b) 3 c) 4 d) 7 11) One atom of Hydrogen has a mass number of 1 and another atom of Hydrogen has a mass number of 2. Are these atoms isotopes? a) Yes b) No

Isotopes

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