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Aleks04 [339]
2 years ago
6

Look up the word periodic in the dictionary propose a reason for the naming of the periodic table

Chemistry
1 answer:
kompoz [17]2 years ago
3 0

Meaning of Periodic in dictionary was found to be "<em>appearing or occurring at intervals</em>".

Purpose of Reason for naming the Periodic Table:

The elements is periodic table have been found of having same iso-electronic properties and the major periodicities found are of two, eight and eighteen respectively.

Examples:

                First Group elements tends to loose only one electron to form M⁺ cation. Starting from Lithium with atomic number 3, secondly sodium which has atomic number 11. When 3 (lithium) is subtracted from 11 (sodium) (i.e. 11-3=8) eight is attained. Same when 11 (sodium) is subtracted from 19 (Potassium), again 8 is obtained. Going downwards the group the number of 18 is obtained i.e. Rubidium (37-19=18), Cesium (55-37=18).

                Seventh Group elements tends to gain only one electron to form X⁻ anion. Starting from Fluorine with atomic number 9, secondly Chlorine which has atomic number 17. When 9 (Fluorine) is subtracted from 17 (Chlorine) (i.e. 17-9=8) eight is attained. Same when 17 (Chlorine) is subtracted from 35 (Bromine), 18 is obtained. Going downwards the group the number of 18 is obtained i.e. Iodine (53-35=18).

<h3>Conclusion:</h3>

                  Hence, we can conclude that Periodic Table is designed in such a way that after a particular interval the chemical and physical properties of elements repeats. Therefore, it can help in understanding the nature of elements without going into experimental experiments.

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Extracted from" Atomic weights of the elements 2009 (IUPAC Technical Report)"

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<em>A friendly dude that likes to help</em>

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alexgriva [62]

The pH of a neutral aqueous solution at 37°C is 6.8.

<h3>What is Kw? </h3>

Kw is defined as the dissociation, which is also known as self-ionization, constant of water. this is an equilibrium constant, and its expression is:

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<h3>Calculation</h3>

Let us suppose concentration of OH and H₃O⁺ is x, to calculate it:

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learn more about pH:

brainly.com/question/9529394

#SPJ4

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