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I'm digging back a ways here, so not sure if this is completely correct.....

Valence shell refers to the electron orbitals an element has. If you look at the Periodic Table, all the elements in any column in the table have similar outer electron orbitals and so all of the elements in that column tend to form molecules of the same sort. For example NaCl (salt) and KCl, where sodium and potasium both form the same sort of molecular bond with chlorine.

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Why does sulfur have a valency of 4 and 6 when it needs only 2 electrons for stable configuration?

It has 6 electrons in it's valance shell and needs 2 more electrons in it's valance shell to become stable. Some atoms, phosphorous for instance ( valance # 5 ), can reach deeper into their valance shell and make additional covalent bonds.


How many valance electrons in neon?

Eight - it has a full outer shell of electrons.


What is the difference between a filled and an unfilled orbital?

A filled orbital has either 2 electrons (if it is the first shell of an atom) or 8 electrons. This is the highest number of electrons these shell can hold Every orbital tends to complete itself to form a stable element. A filled orbital could be any orbital, either 1st, 2nd, second last or last shell of the atom. An unfilled orbital always has atleast one less electron than the shell can hold. It is always the last shell of an atom and always makes the atom unstable as atom tends to acquire inertness by trying to get this unfilled oribital filled.


How many valance electrons are found in an atom what elements Neon?

there are 8 electrons in the valence shell of neon


Why do you think non metals tend to be good at sharing electrons?

All atoms are more stable when their outer most electron shell (valance shell also refered to as a valance orbital but it is slightly different) is full of electrons. Non metals generally have almost full valance shells and it takes less energy to gain a few electrons to reach the stable full outer shell than to lose many electrons to form a stable full outer shell. Take F as an example - it has 7 electrosn in its outermost shell and this shell can fit 8. It will accept 1 electron more easily than losing 7.