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Aleks04 [339]
3 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]3 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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<h3>What does mcg kg mean?</h3>

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Flow rate = 12 ml/hour = 12 ml/hour × 1 hr/60 min = 0.2 ml/min

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where

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volume =  500 ml

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Calculating mcg/kg/minute

So, substituting the variables into the equation, we have

mcg/kg/minute = flow rate × concentration ÷ mass of client

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