Can I get an answer for this, with a review
I think the answer is (1)
all the ions & CO have 10 electrons.
arrows shows "Co-ordinate bond" (දායක බන්ධන) & one arrow head stands for 2 electrons
lines shows "covalent bonds" (සහසංයුජ බන්ධන) those also have 2 electrons
and "." shows 1 electrons
answer is( 1)