Building the Periodic Table

Name: Building the Periodic Table
Author: StemPy Lab

From Dobereiner's triads to Mendeleev's gaps and Moseley's atomic numbers: how the periodic table was built, how new elements are named, and how the s, p, d and f blocks follow from electron configurations.

3 lessons, about 1 h 25 min3 simulations11 problems5 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 30 min
Why classify the elements
By 1865 chemists knew 63 elements and needed order. Dobereiner found triads, Newlands an octave pattern, and Lothar Meyer a periodic curve of physical properties. Mendeleev arranged the elements by atomic mass and by their properties, left gaps for unknown elements, and predicted their properties. Gallium and germanium proved him right.
1 simulation2 practice questions1 Python program4 problems
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Lesson 2about 25 min
The modern periodic law and naming new elements
Moseley found that the frequency of X-rays from an element depends on its atomic number, not its atomic mass. So the modern periodic law says that the properties are a periodic function of the atomic number. The long form has 18 groups and 7 periods. New heavy elements get a temporary IUPAC name built from the digits of the atomic number.
1 simulation1 practice question1 Python program3 problems1 Python lab
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Lesson 3about 30 min
Electronic configurations and the blocks
The period of an element is the shell its outermost electrons are in. The block is the subshell that its last electron enters: s, p, d or f. From the outer configuration you can find the group: 1 or 2 for the s-block, 13 to 18 for the p-block, and 3 to 12 for the d-block. Metals fill most of the table, non-metals sit at the top right, and metalloids lie between.
1 simulation2 practice questions1 Python program4 problems1 Python lab1 question set1 note
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Building the Periodic Table: Practice Paper

15 questions · 20 min

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Building the Periodic Table

Course outline (3 lessons)

Why classify the elements

The modern periodic law and naming new elements

Electronic configurations and the blocks

Test Your Learning

Your teacher

Discussion (0)