What are valence electrons? How many valence electrons are possessed by the nitrogen atom?

Of course this is an electronic charge. And if there are 10 electrons, there is an electronic charge of $-1.602xx10^-18*C$.

Look at the group number at the top of . The column number at the top is the group number. For example, the column with Be at the top is...

Group 2 has two valance electrons. Group 18 would have 8 valance electrons. ( The 10 d electrons will drop down into the next lower shell and are...

This may seem a bit confusing when one looks at , since chlorine is the seventh element in its row, but iodine is the seventeenth. However, in the case of...

All atoms strive for stability. The optima electron configuration is the electron configuration of the VIII A family or inert gases. Look at the electron configuration of the nonmetal...

In terms of actual , there is literally only one example. You can consider that their oxidation states have never gotten higher than $+8$, except for Iridium: In terms...

And the zinc cation is $Zn^(2+)$. When the ions form a salt, clearly they form an electrically neutral species; and thus the formulation of the salt is $Zn_3P_2$. Each phosphorus...

...........which means its ions MIGHT have a $-2$ electronic charge. The oxygen ATOM has $Z=8$, i.e. 8 protonic charges. The neutral atom thus must have 8 electronic charges, 2 of...

There are 4 electron pairs around the nitrogen atom: $3xxN-H$ bonds, and one nitrogen-centred lone pair. The lone pair is stereochemically active (and hence $NH_3$ is a trigonal pyramid, but...

The atom has 7 . As are most elemental gases, chlorine is diatomic, and since the electrons are shared in a covalent bond, each chlorine atom is associated with 8...