How many additional electrons does this atom of oxygen need in its valence shell to satisfy the octet rule? two four six eight

the answer is 2 electrons

Explanation:

The oxygen atom has atomic number 8, therefore its electronic configuration is

         1s² 2s² 2p⁴

the sublevel s has a capacity for 2 electrons so it is full

the sublevel p has capacity for 6 electrons, as in this atom it has only 4 electrons it needs two (2) more electrons to have its full capacity and to achieve maximum stability.

Consequently the answer is 2 electrons

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west