An atom of oxygen has six electrons in its outermost ring and requires two more to become stable. What is the valence number of oxygen

Oxygen in its natural state has 6 valence electrons.

Explanation: The atomic number/ proton number of oxygen is 8, as seen on the periodic table. This is equal to the electron number.

This means there are 2 electrons in the core s shell (innermost), and 6 electrons in the p shell (outermost).

Valence electrons are the electrons found in the outermost shell, so Oxygen has 6 valence electrons.

I don't know if you've been taught electron configuration, but Oxygen's electron configuration is: . The 2s and 2p are orbitals of the outermost ring in Oxygen, so adding 2+4 = 6 valence electrons.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error