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andre [41]
3 years ago
7

The electronic configuration of an atom of element X is 2,8,2 what will be the valency of the element x

Chemistry
1 answer:
KIM [24]3 years ago
6 0

The element is Magnesium

  • It has total 12 electrons

it has electronic configuration

\\ \sf\longmapsto 2,8,2

or

\\ \sf\longmapsto 1s^22s^22p^63s^2

In valence cell it has 2 electrons and therefore its valency is 2

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4 years ago
PLEASE HELP I NEED IT!!!!!
galina1969 [7]
Answer:
Molarity = 2.3 M

Explanation:
Molarity can be calculated using the following rule:
Molarity = number of moles of solute / volume of solution

1- getting the number of moles:
We are given that:
mass of solute = 105.96 grams
From the periodic table:
atomic mass of carbon = 12 grams
atomic mass of hydrogen = 1 gram
atomic mass of oxygen = 16 grams
Therefore:
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Now, we can get the number of moles as follows:
number of moles = mass / molar mass = 105.96 / 46 = 2.3 moles

2- The volume of solution is given = 1 liter

3- getting the molarity:
molarity = number of moles of solute / volume of solution
molarity = 2.3 / 1
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Hope this helps :)
8 0
3 years ago
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Question 5 (5 points)
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Explanation:

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3 years ago
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