Periods are what that run left to right?

Answer 1

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.

Answer 2

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.

Answer 3

Periods are punctuation marks that typically indicate the end of a sentence. They are used to show a full stop in writing and are placed at the end of declarative or imperative sentences. Periods are important for conveying clear and concise information in written communication.

Answer 4

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