What is the third chemical element?

Question:

What is the third chemical element?

Periodic Table:

Chemical elements are arranged on the periodic table of elements by their number of protons and the number of electrons in their outer shell. The number of protons assigned to an element increase as we move from left to right. However, each column corresponds to the number of electrons in the outer shell, except for transition metals.

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The Periodic Table: Properties of Groups and Periods

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Chapter 3 / Lesson 1
204K

Learn about the organization of the periodic table into groups and periods and how these differ. Also learn the history of the periodic table and its properties.


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