A. 7.0
B. 10.9
C. 12.5
D. 13.0
E. 17.0

Correct Answer: Option D

Explanation

Mg = 5N

T² = 5² + 12²

T = 13N

SEE ALSO  The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?

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