Question

Calculate the number of neutrons in the following.

(a)15 X 31
(b)92 U 235
(c)19 K 39

(Note that the number before the letter is subscript and the number after is superscript)​

Answer 1

Answer:

a) 31-15=16n

b)235-92=143n

c)39-19=20n

Explanation:

n denotes number of neutrons.

Answer 2

Answer:

number of neutron =atomic mass-atomic number

so

for X 31-15= 16

for U 235-92=143

for K 39-19 =20