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Yes periods run from left to right (horizontal) on a Periodic Table and they also tell you how many shells of electrons or energy levels each element has. E.g. Bromine is in the row of period 4 and has 4 energy levels or you can say 4 shells of electrons

Groups are the vertical columns and the number of each group tells you how many electrons are in the outer shell of the element. E.g. Sodium (Na) is in goup 1 and its electronic configuration is 2.8.1 -it has 1 electron in its outer shell.

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14y ago
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14y ago

There's an increase of exactly ONE each step to right in

  • atomic number =
  • number of protons =
  • number of electron =
  • The no of a period indicates the no of shells in the atoms, so in a period the no of shells in atoms are same but nuclear charge increases from left to right as the result of which atomic size decreases and ionization energy increases from left to right.
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9y ago

the groups varied from 1 to 18 from left to right from metals in group 1 and 2 to noble gases in 18 group

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Q: Periods are what that run left to right?
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How do element's groups run and how do element's periods run?

groups run top to bottom periods run left to right


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