How Many Neutrons Are There in an Atom Of ${ } _ { 19 } ^ { 39 } \mathrm {~K}$

question 159

Multiple Choice

How many neutrons are there in an atom of ${ } _ { 19 } ^ { 39 } \mathrm {~K}$ ?

• A) 19
• B) 20
• C) 39
• D) 58

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