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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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For which of the following activities might you want to hire a chemist?

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Which of the following procedures involves a physical change in one of the substances?

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7 0
2 years ago
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When biological samples of unknown origins are discovered at a crime scene, what should investigators do?a. assume no pathogens
adoni [48]

Answer: assume pathogens are present and treat the samples accordingly

Explanation:

When investigators are unable to conclusively ascertain the source of a biological sample found at a crime scene, the correct thing to do is to treat it as if pathogens are present in it and handle it according to set rules on how to handle pathogens.

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3 0
3 years ago
Determine the molecular
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Answer:

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7 0
3 years ago
A tank of gas has partial pressures of nitrogen and oxygen equal to 1.61 × 104 kPa and 4.34 × 103 kPa , respectively.What is t
Alchen [17]

Answer:

20.44\times 10^3 kPa is the total pressure of the tank.

Explanation:

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Partial pressure of oxygen =  p_{O_2}=4.34\times 10^3 kPa

Total pressure of gases in the tank = P

Applying Dalton's law of partial pressures :

P=p_{N_2}+p_{O_2}=1.61\times 10^4 kPa+4.34\times 10^3 kPa

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20.44\times 10^3 kPa is the total pressure of the tank.

7 0
2 years ago
How many atoms are in 578g Na
borishaifa [10]

1.51 x 10²⁵atoms

Explanation:

Given parameters:

Mass of Na = 578g

Unknown:

Number of atoms = ?

Solution:

 To find the number of atoms, we must first find the number of moles the given mass contains.

  Number of moles  = \frac{mass}{molar mass}

   molar mass of Na = 23g

 Number of moles =  \frac{578}{23} =  25.13moles

   1 mole of a substance = 6.02 x 10²³atoms

    25.13 mole of Na = 25.13 x  6.02 x 10²³atoms

 This gives  1.51 x 10²⁵atoms of Na

Learn more:

Avogadro's constant brainly.com/question/2746374

#learnwithBrainly

5 0
3 years ago
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