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lesya692 [45]
2 years ago
6

In the ground state, which atom has a completely filled valence electron shell?(1) C (2) V (3) Ne (4)Sb

Chemistry
2 answers:
AVprozaik [17]2 years ago
7 0
The answer is (3)Ne. Usually, the elements belongs to group 18 all have completely filled valence electron shell. Among the four elements carbon, vanadium, neon and antimony, only neon belongs to group 18.
Irina18 [472]2 years ago
6 0

In the ground state, the atom that has a completely filled valence electron shell is NEON, Ne.

In the periodic table of elements, the elements that have completely filled valence electron shell are the noble gases and neon is one of them. The noble gases has eight electrons each in their outermost shells, this makes them to be stable and thus, they are unreactive in nature. The other elements in the periodic table usually undergo chemical reactions in order to have eight electrons in their outermost shells just like the noble gases.

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Explain the reason for low melting and boiling point of a covalent compound ​
mylen [45]

Answer:

Covalent compounds have weak forces of attraction between the binding molecules. Thus less energy is required to break the force of bonding. Therefore covalent compounds have low melting and boiling point.

Explanation:

3 0
3 years ago
Read 2 more answers
The pH of a 1.0M solution of butanoic acid HC4H7O2 is measured to be 2.41. Calculate the acid dissociation constant Ka of butano
Lubov Fominskaja [6]

Answer:

Ka = 1.52 E-5

Explanation:

  • CH3-(CH2)2-COOH ↔ CH3(CH2)2COO-  + H3O+

⇒ Ka = [H3O+][CH3)CH2)2COO-] / [CH3(CH2)2COOH]

mass balance:

⇒<em> C</em> CH3(CH2)2COOH = [CH3(CH2)2COO-] + [CH3(CH2)2COOH] = 1.0 M

charge balance:

⇒ [H3O+] = [CH3(CH2)2COO-]

⇒ Ka = [H3O+]²/(1 - [H3O+])

∴ pH = 2.41 = - Log [H3O+]

⇒ [H3O+] = 3.89 E-3 M

⇒ Ka = (3.89 E-3)² / ( 1 - 3.89 E-3 )

⇒ Ka = 1.519 E-5

3 0
3 years ago
The reaction H2SO4 + 2 NaOH -&gt; Na2SO4 + 2H2O represents an acid-base tritration. The equivalence point occurs when 24.75 mL o
artcher [175]
            moles NaOH = c · V = 0.2432 mmol/mL · 24.75 mL = 6.0192 mmol
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Hence
            [H2SO4]= n/V = 3.0096 mmol / 38.94 mL = 0.07729 M
The answer to this question is  [H2SO4] = 0.07729 M

6 0
3 years ago
Claim how the ecosystem is changing.
Maslowich

Answer:

The environment Ecosystems are also affected by climate change. Habitats are being modified, the timing of events such as flowering and egg laying are shifting, and species are altering their home ranges. Changes are also occurring to the ocean.

Explanation:

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3 years ago
Which of the following is not a correct formula? A)Ba2O B)Ca3N2 C)KCl D)Li2S
love history [14]

Answer:- A. Ba_2O is not the correct formula.

Explanations:- Charge for Ba is +2 and charge for O is -2, Here the charges are in equal and opposite so their ratio is 1:1 and hence the formula must be BaO and not Ba_2O.

Rest of the formulas are correct as charge for Ca is +2 and charge for N is -3 . On criss cross we get the formula Ca_3N_2 .

Charge for K is +1 and charge for Cl is -1 and so KCl is correct.

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3 years ago
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