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Bad White [126]
3 years ago
12

What is the electronegativity value for an element whose atoms in the ground state have an electron configuration of 2-8-8-1 ?

Chemistry
1 answer:
Karo-lina-s [1.5K]3 years ago
7 0

The electronegative value of Potassium is 0.8 Pauling units

<h3 /><h3>What is Electronegativity:</h3>

This is the tendency or strength which an atom attracts or pulls a shared electron in a covalent bond.

The electronegative value of an element is basically the strength or affinity towards electrons of other atoms and it follows a trend in the periodic table which <u>is it increases across the period and decreases down the group</u>.

In the given question, we have an element with electron configuration 2, 8, 8, 1. Sum this up and we would get the atomic number of the element.

2+8+8+1=19

The element with an atomic number of 19 is <u>potassium</u> which belongs to group (i) and they're primarily consisted of metals with high electro-positivity which tends to make their electron affinity lower and they generally have smaller or lower electronegative value.

Using the periodic table, we would easily see that the electronegative value of Potassium is 0.8 Pauling units.

Learn more on electronegativity here:

brainly.com/question/15484832

brainly.com/question/17762711

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In the disproportionation reaction CI2 + H2Omc021-1.jpgHCIO + HCI, what describes the oxidation states of the substance Cl?
Sophie [7]
<span>Reaction: CI2 + H2O    ---->  HCIO + HCI

Oxidations states:

The oxitation state of Cl2 = 0, because the oxidation state of an atom alone or a molucule with one kind of atom is always 0.

The oxidation state of Cl in HClO is +1 because the oxidation state of H is + 1, the oxidation state of O is - 2, and the molecule is neutral, so  +1 + 1 - 2 = 0

The oxidation state of Cl in HCl is - 1, because the oxidation state of H is +1 and the molecule is neutral, so - 1 + 1 = 0.

Also, you shall remember that when an atom increases its oxidation state is is oxidized and when an atoms reduces its oxidations state it is reduced.

With that you conclude that the right option is the last statement: </span>Cl has an oxidation number of 0 in Cl2. It is then reduced to CI- with an oxidation number of –1 in HCl and is oxidized to Cl+ with an oxidation number +1 in HClO.
8 0
4 years ago
Can someone solve this problem 5
Westkost [7]

Answer:

2

Step-by-step explanation:

A. Moles before mixing

<em>Beaker I: </em>

Moles of H⁺ = 0.100 L × 0.03 mol/1 L

                   = 3 × 10⁻³ mol

<em>Beaker II: </em>

Beaker II is basic, because [H⁺] < 10⁻⁷ mol·L⁻¹.

        H⁺][OH⁻] = 1 × 10⁻¹⁴   Divide each side by [H⁺]

             [OH⁻] = (1 × 10⁻¹⁴)/[H⁺]

             [OH⁻] = (1 × 10⁻¹⁴)/(1 × 10⁻¹²)

             [OH⁻] = 0.01 mol·L⁻¹

Moles of OH⁻ = 0.100 L × 0.01 mol/1 L

                      = 1 × 10⁻³ mol

B. Moles after mixing

                 H⁺    +    OH⁻   ⟶ H₂O

I/mol:      3 × 10⁻³   1 × 10⁻³

C/mol:   -1 × 10⁻³  -1 × 10⁻³

E/mol:    2 × 10⁻³          0

You have more moles of acid than base, so the base will be completely neutralized when you mix the solutions.

You will end up with 2 × 10⁻³ mol of H⁺ in 200 mL of solution.


C. pH

 [H⁺] = (2 × 10⁻³ mol)/(0.200 L)

        = 1 × 10⁻² mol·L⁻¹

 pH = -log[H⁺ ]

       = -log(1 × 10⁻²)

       = 2

6 0
3 years ago
An aqueous potassium chloride, KCl, solution is made by dissolving 0.295 0.295 mol KCl in 740.0 740.0 g of water. Calculate the
Pepsi [2]

Answer:

Molality is 0.40 m

Explanation:

Molality is a sort of concentration that indicates the moles of solute dissolved in 1kg of solvent.

To determine molality we need the moles of solute, and the mass of solvent in kg so:

We convert the mass of solvent from g to kg:

740 g . 1kg/1000g = 0.740 kg

We know the moles, so we can determine molality

Molality (mol/kg) = 0.295 mol/ 0.740kg = 0.40 m

6 0
3 years ago
Read 2 more answers
NEED HELP!! WILL NAME THE BRAINIEST!!!
Paladinen [302]

Answer:

elements

Explanation:

3 0
3 years ago
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What type of reaction is: CaO + H2O -&gt; Ca(OH)2?
asambeis [7]

Answer:

Combination reaction

8 0
3 years ago
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