Question

Select the correct answer.

An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?
A.
10
B. 20
C.
30
D. 0
E. 200
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Answer 1

i think 10 because

atomic number (p^+) =10

atomic mass (e^-) = 20

atomic no =(p^+) =(e^-)=10

(p^+)=10

(e^-)=10

again

atomic number= (p^+) + (n^0)

20 = 10 +n^0)

20-10 =n^0

n^0= 10