Is 19.4km, north scalor or vector quantity?

it is a vector quantity

Explanation:

vector quantity is a quantity which is described by it magnitude and direction

19.4 km is its magnitude and north is direction

b.

the accuracy of the data.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72