The atomic numbers of three elements X, Y, Z are 6, 11, 17 identify the compounds formed

i) $X=6-1s^{2}2s^{2}2p^2$  forms bond only by sharing valency is 4

ii) $Y=11-1s^{2}2s^{2}2p^{6}3s^1$  it’s a metal with valency 1

iii) $Z=17-1s^{1}2s^{2}2p^{6}3s^{2}3p^5$  it’s a non-metal with valency 1

Y, X combine to form carbides like $N{a}_2{C}_2$  $\left[Na-C\equiv C-Na\right]$ .