Consider the following pairs of ions or atoms1. Na+ and NC2. Na+ and K+3. K+ and C-In which of these pair are the ions/atoms iso-electronic with each other ?

Consider the following pairs of ions or atoms1. Na+ and NC2. Na+ and K

1.	Consider the following pairs of ions or atoms1. Na+ and NC2. Na+ and K+3. K+ and C-In which of these pair are the ions/atoms iso-electronic with each other ?
A.	1, 2 and 3
B.	1 and 2
C.	2 and 3
D.	1 and 3
Answer» E.