Electronic configuration of same elements are given. Write answers to the following questions.
i. $$[Ne]3s^2$$
ii. $$[Ar]3d^2,4s^2$$
iii. $$[Xe]6s^2$$
iv. $$[Ne]3s^2,3p^2$$
Which element shows the possibility of $$+2$$ oxidation state?
i. $$[Ne]3s^2\rightarrow \ _{12}Mg$$
ii. $$[Ar]3d^2,4s^2 \rightarrow \ _{22}Ti$$
iii. $$[Xe]6s^2\rightarrow\ _{56}Ba$$
iv. $$[Ne]3s^2,3p^2\rightarrow\ _{14}Si$$
all element has the possibility to show $$+2$$ oxidation state except $$[Ne]3s^2,3p^2\rightarrow\ _{14}Si$$.