An atom has an electronic configuration 2, 8, 5.

To which of the following elements would it be chemically similar?

$\text{P}(\text{Z}=15)\text{E.C}=1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^3;\text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}N(Z=7)\hspace{0.17em}EC}=1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^3$

Both Nitrogen and Phosphorous belong to VA group, So Nitrogen (Z = 7) is chemically similar to Phosphorous (Z = 15).  Due to same group elements exhibits chemically similar properties.