Why are atomic nuclei decrease from left to right along a period for normal elements
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Why are atomic nuclei decrease from left to right along a period for normal elements?
=> Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. This means that the nucleus attracts the electrons more strongly, pulling the atom's shell closer to the nucleus.
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This is caused by the increase in the number of protons and electrons across a period.
One proton has a greater effect than one electron; thus, electrons are pulled towards the nucleus, resulting in a smaller radius.
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