What is a valence electron? How many valence electrons does an element in Group 2 have? Group 18?

It is a period or row that is energy level five or more, below calcium on . Two valence electrons places the element in the alkaline earth family or...

Nitrogen is in Group V. It has 5 . Do I win £5-00?

The valence shell is the last shell which the element's electrons take up. (In this case Magnesium) In the first shell you can fit 2 electrons, 8 in the second,...

Plutonium's is a weird one, where it is: $[Rn]5f^6\7s^2$ Source: Its outermost shell is therefore its $7s$ shell, which contains $2$ electrons, and therefore it has $2$ .

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...

Since, $5s$ orbital is fully filled, so the element $X$ lies in $5^(th)$ principal shell, i.e. it lies in the $5^(th)$ period. Now, since the $4d$ subshell is partially filled,...

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...

The element is Nickel ($"Ni"$) with $28$ valence eletrons. The period is identified looking at the level of energy ($n$) which is the number $4$, for the $4s$ orbital. This...