a) 

${}_{6}C:1s^{2}2s^{2}2p^2$  

b)

${}_{6}C:1s^{2}2s^{1}2p^3$

c)

${}_{14}Si:1s^{2}2s^{2}2p^{6}3s^{2}3p^2$  

d) 

${}_{14}Si:1s^{2}2s^{2}2p^{6}3s^{1}3p^3$