The Periodic Table. Chapter 17 Section 3. Periodic. The word periodic means “repeated pattern”. Lunar Cycle Days of the week Months of the year Seasons. Dmitri Mendeleev. A Russian chemist in the late 1800’s who looked for a way to organize the elements using a “ periodic pattern”.
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Mendeleev organized his chart from lightest-to-heaviest elements and then used a repeating pattern based on the Physical & Chemical properties of the elements.
The prefix Eka mean close to or related to.
Germanium was discovered by a ________ scientist.
Gallium was discovered by a ________ scientist.
This is what is looks like today.
Every empty green slot is a spot where Mendeleev predicted an unknown element would go.
Mendeleev’s Predicted Elements
Every white slot represented a possible unknown elements, but Mendeleev did not have enough information to make predictions about the properties of these elements.
Disposal of Sodium
Brainiac – Alkali Metals
Hydrogen & Helium
(a.k.a. – electron dot diagram) to help us figure out how elements interact with each other to do chemistry!