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Periods on the Periodic Table refer to the rows of elements. As the elements progress to the right, the atomic numbers increase, usually in steps of 1.

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9y ago
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14y ago

In the periodic table, as you go from left to right across a periodic table the atomic no.

increases by one. This happens because of addition of one proton and one electron

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12y ago

It decreases

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Q: What happens to the atomic number as you go from left to right across the periodic table and why does this happen?
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