How does an atom's valence electron configuration determine its place in the periodic table?

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How does an atom's valence electron configuration determine its place in the periodic table?

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Answer 1 · 2016-11-28T23:54:01

Elements in a family (groups, the vertical bits) have the same number of valence electrons. The level of energy of an atom's valence electron(s) determines its period, (the horizontal lines).

Explanation:

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When you're looking for the element, try to fill in from what you're given.

E.g: Let's say you're working with Aluminium(Al),

That configuration is $1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^1$

See how it filling in across until it reached Aluminium?

Now, if you had $1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^6$ $4s^2$ $3d^7$ it would be the same thing, fill in until you reach your desired place.

You would get Co, Cobalt.

Hope this helps.

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How does an atom's valence electron configuration determine its place in the periodic table?

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