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what makes atom,compound stable?

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what makes atom,compound stable?

Post  yurisaki on Sun Feb 01, 2009 11:19 pm

I know that an atom is stable if it has neutral charge and the valence shell is complete.
are elements with high ionization stable? why?

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Re: what makes atom,compound stable?

Post  funion987 on Sun Feb 01, 2009 11:26 pm

Like high ionization energies? Elements with higher ionization energies (such as oxygen, for example) are stable in the fact that they will not lose electrons. However, they do have a high electron affinity, so oxygen is unstable and will try to gain 2 electrons.

But as far as going down a group like the alkali metals, Na is much more stable than Cs because it takes more energy to remove an electron. Na is therefore less reactive, but not necessarily unreactive.
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