Question

Two elements, 16
8 X and 18
9 Y . Then the ratio of the Neutrons of X and Y is ........
A) 1 : 1 B) 1 : 2 C) 3 : 2 D) 4 : 5

Answer 1

Answer:

option d is correct for first atom 8x16 means 8 is atomic no. and atomic mass is 18 then then neutron is 8 and 9Y18 then neutron is 9 so 8/9

Answer 2

Answer:

number of neutrons = atomic mass - atomic number.

so the answer is option D