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Why do atoms tend to get smaller going left to right across a period?

April 26, 2017atoms going Left period right smaller

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Why do atoms tend to get smaller going left to right across a period?

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Elements on the left side of a period have fewer electrons and protons than elements on the right side. More protons make the atom smaller; more electrons make it slightly larger. The effect of the protons wins out when the electron was added to an incomplete valence shell.