Intro to Chemistry

study guides for every class

that actually explain what's on your next test

Periods

from class:

Intro to Chemistry

Definition

Periods are the horizontal rows in the periodic table. They indicate the number of electron shells an atom possesses.

congrats on reading the definition of periods. now let's actually learn it.

ok, let's learn stuff

5 Must Know Facts For Your Next Test

  1. There are 7 periods in the periodic table.
  2. Elements in the same period have the same number of electron shells.
  3. The atomic number increases from left to right across a period.
  4. Chemical properties vary widely across a single period.
  5. Period number corresponds to the highest energy level that contains electrons in ground state.

Review Questions

  • How many periods are there in the periodic table?
  • What do elements in the same period have in common?
  • How does the atomic number change as you move across a period?
© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
Glossary
Guides