Prime numbers differeing by 2 are called _____

Give three pairs of prime numbers whose diffrene is 2.[Remark:Two prime numbers whose difference is 2 are called twin primes]

Give three pairs of prime numbers whose difference is 2. IRemark: Two prime numbers whose difference is 2 are called twin primes]

Give three pairs of prime numbers whose difference is 2.[Remark : Two prime numbers whose difference is 2 are called twin primes]

The primes which are differ by 2 are called …………………… numbers.

Elements having the same atomic number , but different mass number are called____.