Question

Among the following the odd pair is
a) 18O8, 37C17 b) 40Ar18, 14N7
c) 30Si14, 31P15 d) 54Cr24, 9K19

Answer 1

"Answer: c) 30Si14, 31P15.

Apart from the given pairs of elements, this pair is the odd one out. Because the atomic number of the element Si (Silicon) is 14 and its mass number is 30, which means it has 14 electrons and 14 protons. If there are 14 protons then there is 16 neutrons in it (30-14=16).

Also, in the element P (Phosphorus) the atomic number is 15 and the mass number is 31. Such that the number of electrons and protons is 15 then, the number of neutrons is 16 (31-15=16).

This is the only pair that has equal number of neutrons."

Answer 2

Answer:

bnnjhhjhghuryhbgkggojh