Based on the location of nitrogen (n) on the periodic table, how many additional electrons does a nitrogen atom need in its valence shell to satisfy the octet rule when it forms bonds?

one
three
five
eight

Octet rule says the valance (outer most shell) orbit should be occupied with either 2 (for small elements like Hydrogen and lithium) or 8 electrons.
Now Nitrogen has atomic number of 7 means (2,5) it has 5 electrons in its outer shell. Nitrogen needs 3 electron to satisfy octet rule.

The Answer is B

Cin carbonh in hydrogeno in oxygen