Name: _________________________________________________ Date: __________________ Period: _________
Introduction to the Periodic Table: Flipped Assignment
Directions: Follow the steps below in order to be prepared for class tomorrow. This worksheet will be
turned in for a grade.
1. Watch the video titled “The Periodic Table: Crash Course Chemistry #4”. The video can be found on
YouTube at the following link: https://www.youtube.com/watch?v=0RRVV4Diomg
2. While you are watching the video, respond to the following questions in the space provided.
a. Describe Dmitri Ivanovich Mendeleev’s contribution to the Periodic Table.
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b. Roughly how many elements were known to mankind in the 1860s and how were they sorted?
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c. List 5 of the elements that were known during that time.
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d. What non-reactive elements hadn’t been discovered yet?
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e. The periodicity of elements is a _____________________ phenomenon.
f. Which atomic particles were not discovered during Mendeleev’s lifetime?
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"I saw in a dream, a table where all elements fell into place as required. Awakening, I immediately wrote it
down on a piece of paper, only in one place did a correction later seem necessary."
— Mendeleev, as quoted by Inostrantzev