Comments about "Periodic table" in Wikipedia

This document contains comments about the article Periodic table in Wikipedia
In the last paragraph I explain my own opinion.

Contents

Reflection

Introduction

The article starts with the following sentence.
The periodic table, also known as the periodic table of (the) chemical elements, is a tabular display of the chemical elements.
THey are a reflection of the physical reality.

1 Overview

The smallest constituents of all normal matter are known as atoms. Atoms are extremely small, being about one ten-billionth of a meter across; thus their internal structure is governed by quantum mechanics.
The internal structure is described by quantum mechanics.
The periodic table is a graphic description of the periodic law, which states that the properties and atomic structures of the chemical elements are a periodic function of their atomic number.
Considering each element and considering that each element has neither a positive or negative charge then the number of electrons and the number of protons of elements are the same. What is even more important that, based on observations, no elements are missing
Furthermore, electrons obey the Pauli exclusion principle: different electrons must always be in different states.
This is a very strange principle.
In fact when a proton is added, the first assumption is that the position of the added proton is different from the other protons. Secondly that the position of all the electrons will be influenced.
The same will happen when an electron is added. Also here the first assumption is that the position of the added electron will be different from all the other electrons. The second assumption is that the positions of all the protons will also change.
Each orbital can contain up to two electrons: they are distinguished by a quantity known as spin, which can be up or down.
How is this established by mean of experiment? In some sense the two electrons are entangled.

1.1 Presentation forms

2 Periodic trends

2.1 Atomic radius

2.2 Ionisation energy

2.3 Electron affinity

2.4 Electronegativity

2.5 Metallicity

2.6 Further manifestations of periodicity

3 Classification of elements

4 History

5 Current questions

5.1 Period 1

5.2 Group 3

5.3 Superheavy elements

6 Future extension beyond the seventh period

7 Alternative periodic tables

8. See also

Following is a list with "Comments in Wikipedia" about related subjects

Reflection 1 Physical Description

The importance of the periodic table is that it gives a physical description of the internal structure of an atom ie. each element. What the building blocks are and where they are.

Reflection 2

Reflection 3

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Created: 18 December 2021

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