Atoms & Molecules

6 important questions on Atoms & Molecules

Which element is the human body prodominently made up of?

Oxygen. 65% of the your mass is oxygen, mostly in the form of water

What can be approximated(guessed) by the mass number?

The atomic mass

What is the reason that the mass number of carbon isn't exactly twelve?

Isotopes.
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What is the driving force behind elements that form molecules?

Sharing of electrons.

Elements with a full valence shell (8 electrons = OCTET) are inert. What does that mean?

That they have no driving force to react and that they have achieved the most stable configuration of 8 valence electrons.

The way that electrons are arranged is in an three dimensional way. How is this also named?

Orbitals

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