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HELP! The atomic number of krypton (Kr) is 36, and its mass number is 84. How many neutrons does it have?
A.
18
B.
36
C.
48
D.
72
Simple thing to bear in mind; The number of neutrons is equal to the Atomic number - the Mass number. Because the Atomic number tells you the number of Protons, whilst the mass number tells you the number of both PROTONS and NEUTRONS. So 84 - 36 is 48. You have 48 neutrons
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