3 point different between fundamental units and derived units

Fundamental Units:

1) Fundamental units also called base units are used to describe base quantities

2) They cannot be expressed in terms of derived units.

3) Examples : Meter, Ampere, Second etc.

Derived Units:

1) Derived units are used to describe derived quantities.

2) They can be expressed in terms of fundamental units.

3) Examples: Newton, Joule, Hertz, Pascal etc.

what is the question?

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!

if you need further assistance, let me know: )

~ trueboss72