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vova2212 [387]
3 years ago
6

How are the elements arranged in the modern periodic table?

Chemistry
2 answers:
VladimirAG [237]3 years ago
5 0
In the modern periodic table, elements are arranged by atomic number.<span> They are placed with the lowest atomic number first, and elements with increasing atomic numbers run to the right. They are also arranged in vertical columns known as groups, with these groupings based on shared properties.</span>
Maru [420]3 years ago
3 0

Answer choices are:

A. by increasing atomic mass

B. by decreasing atomic mass

C. by increasing atomic number

D. by decreasing atomic number

____________________________________________________________

Correct answer choice is:

C. By increasing atomic number

____________________________________________________________

Explanation:

The modern periodic table is a table comprising the components organized in a progression of increasing atomic number. A vertical column termed as a group includes elements with related characteristics. A horizontal row is called a period.

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How many grams of Carbon dioxide (CO2) are needed to create a 40M
andre [41]

264 grams of Carbon dioxide (CO2) are needed to create a 40M  solution in 150ml of solution.

Explanation:

Given :

molarity of the solution = 40M

Volume of the solution = 150ml or 0.15 litres after dividing it by 1000

compound is carbon dioxide

atomic mass of CO2 = 44.01 gram/mole

mass of CO2 = ?

moles of Co2 =?

the relation between grams and molarity is given by:

number of moles = \frac{mass}{atomic mass of 1 mole}  equation 1

molarity is given by :

Molarity = \frac{number of moles}{volume in litres}  equation 2

 Putting the value of number of moles in equation 2

molarity = \frac{mass}{atomic mass x volume}

mass = molarity x atomic mass x volume

mass = 40 x 0.15 x 44.01

         = 264 grams

264 grams is the mass of carbon dioxide required to make a solution of 40 M in 150 ml of solution.

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3 years ago
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Blizzard [7]

Answer:

169

Explanation:

protons+neutrons=atomic mass

70+99=169

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