How Many Valence Electrons Does O2 Gas Have? How Can You Tell?

Question

^^^^^^^

How Many Valence Electrons Does O2 Gas Have? and how can you tell from the periodic table?

Answer 1

You can use the "2,8,8 rule" to calculate. (The first shell nearest to the nucleus can hold 2 electrons, the 2nd nearest can hold 8 and also the 2rd nearest.
Oxygen is proton no. 8. since neutral atom, has equal no. of protons and electrons. so there are 8 electrons in oxygen.
using the above rule.,
the (1st) innermost electron shell has 2 electrons (so, 8-2=6 left)
the (2nd) inner electron shell has 6 (6-6=0 left)
hence the outermost shell electrons are the valence electrons, which is 6.

Answer 2

O2 gas doesn't have any valance electrons. Two oxygen atoms are bound covalently to get rid of valency and form O2 gas. If we take an oxygen atom it has 6 valence electrons. Oxygen is in 6th column and they have 6 valance electrons. Oxygen atom need 2 more electrons to get rid of valency. Therefore it doesn't give the six. It try to receive two more.

Answer 3

Twelve. Each oxygen atom has six. The number of valence electrons per shell is, for the first three shells, 2, 8, 18. Oxygen has two electrons in the inner shell, leaving six for the next one.

Answer 4

Each oxygen atom has 6, so the molecule overall would have 12.

Subtract the number of electrons from the next lowest noble gas (in this case, helium) from the atomic number to get the number of valence electrons. Or, realize that the electron structure of oxygen is 1s2 2s2 2p4.

Answer 5

Oxygen is in group 6A of the table. This means it has 6 valence e-. Since you have two oxygen atoms in O2 you have 12 total valence e-. That means when you do a Lewis-dot structure of O2 you must place 12 dots for the two atoms.

Answer 6

For the best answers, search on this site https://shorturl.im/ICl9h

Ok.....oxygen becomes O2-,Na becomes Na+,and F becomes F-. So WHY???? Well,a valence electron is an electron that has a full outer shell.We'll call it a shell since it looks like one(round,smooth),although it is actually the amount of electrons an atom's nucleus can hold within that orbit,like the Sun holds all the planets together,except this is like the Solar System on steroids. Anyways,when the atom has eaten its fill of electrons,bullying any other weaker atoms in its way to get its fill,it is satisfied when iit is 'full',meaning all its outer electrons are filled.No more,no less.Like with humans,too many electrons would be like an obese person;one would need to lose all that flab,and become normal-sized.Likewise,the atom would need to lose electrons to become stable.Also,too little electrons is like an anorexic person;needs to bulk up.So,the electron needs to gain more electrons to become stable. Now,the problem here is;some atoms are just naturally unstable.For example,sodium naturally has one EXTRA electron from that perfect stability.So,it REALLY tries to WORK OFF THAT EXTRA FATS,so to speak,to lose that extra electron,to be perfect.So,all it needs to look for now is somewhere to put that electron. Lets look af Flourine.FLourine is REALLY anorexic;it has one electron less.So,what does it do?It asks sodium politely if it can have that extra electron.Sodium of course agrees,and they exchange. See the problem here?If sodium and fluorine were natural before with their fatness and thinness,what are they now?They are called IONS;they have stable electron configuration,but have unnatural electron configuration. So,all you need to do is look ad your good ol' Periodic table.Look under the same row of whatever element you want to choose and look at the electron configuration of the noble gas of that particular row.For example,neon has the atomic number 10.Say you want to find Oxygen,which has the atomic number 8.So,since neon is the perfect one,and oxygen wants to get to that number,oxygen need to GAIN 2 electrons.We call this ion O2-,since we take perfect as 0,and anything below that is -,and everything above it is +.Therefore,since Sodium is 11,it needs to LOSE one to become neon,since its easier to lose one electron and become neon's configuration than gaining 7 and becoming the noble gas of that row.So,sodium becomes Na+ As a general rule of thumb,the left side of the Periodic Table is +,and the right side is -.There exceptions however,which you have to memorise.So,does that answer your question?

Answer 7

count left to right 1-8 that is the number in the outmost subshell. Total electrons is same as protons unless ionized.