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Being radioactive, uranium is not a stable element.
Halons are a class of element, not a type of charge. As for why the halogens have the most stable charges, they don't - at least not all of them.
Beryllium is a stable element.
electrons are transfered from one atom to another when it is negatively or positively charged. this is done so that the atom can be come stable. for an atom to become stable the amount of electrons on the orbital must be equal to the amount of protons so that atom would have no charge.
Nothing. Krypton is already just about as stable as it's possible for an element to get.
It has a negative charge; to be more specific it has a charge of -3, since it has only 5 valence electrons and it would like to gain 3 more to be stable at 8.
An oxidation number of 3 means that the element has a charge within the compound of +3. For example: AlCl3 (Aluminum chloride). Cl has a charge of -1 because it gains 1 electron during bonding to become stable so Al has to have a charge of +3 to balance the overall charge of the compound to zero.
An element's oxidation number indicates how many electrons an atom has gained, lost, or shared to become stable.
Not always -- Hydrogen-3 is radioactive, for example.
Yes, it is. Since valency is the no. of electrons an element should gain or loose or share to become stable. So, this is true in case of substances which form ions. But elements like carbon never form ions. Its valency is four. It shares electrons to get stable.
A stable element is any non-radioactive element. All elements before element atomic number 84 (not including 84) - Polonium (Po) are stable elements.
Fluorine will gain one electron to form F- (or fluoride) ion. Fluoride ion has a charge of -1.