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4 years ago

Which of the following elements have the same number of valence electrons?

1 answer:

5 0

The answer is II. Oxygen, IV. Sulfur, and V. Selenium.

Explanation:

Going down the list that was provided, we can use the periodic table of elements to determine the valence electrons.

- Nitrogen has 5 valence electrons
- Oxygen has 6 valence electrons
- Fluorine has 7 valence electrons
- Sulfur has 6 valence electrons
- Selenium has 6 valence electrons

Since oxygen, sulfur, and selenium all have 6 valence electrons, then that is the correct answer.

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Electrophilic addition of bromine, Br2, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermedia

Taya2010 [7]

Answer:

See explanation and image attached for details

Explanation:

The reaction involves the heterolytic fission of the Br-Br bond in the bromine molecule to yield a bromine cation which attacks the but-1-ene to form a cyclic intermediate called the brominium ion. The bromine anion must now attack from the opposite face of the brominium ion due to steric clashes to form a product of a 1,2-dibromoalkane having the anti- stereochemistry.

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3 years ago

Match the following terms:

AURORKA [14]

Answer:

See below ~

Explanation:

A to B

⇒ Solid Phase

==========================================================

B to C

⇒ Melting

==========================================================

C to D

⇒ Liquid Phase

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D to E

⇒ Vaporizing

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E to F and beyond

⇒ Gas Phase

3 0

2 years ago

Arrange these elements based on their atomic radii. ga, f, s, as

mamaluj [8]

please have look at Periodic table , you will solve it yourself !

5 0

3 years ago

A 5.32 g mixture contains both lithium fluoride, LiF, and potassium fluoride, KF. If the mixture contains 3.12 g fluorine, what

bulgar [2K]

Answer:

The mass of KF in the mixture is 2.77 gms.

Explanation:

Given;

Total weight of mixture (LiF+KF)=5.32gms

Let, mass of KF in the mixture = x gms

⟹ mass of LiF in mixture =(5.32-x)gms.

We know that :

Atomic weight of F=19gms.

Atomic weight of Li =7gms.

Atomic weight of K = 39 gms.

moles=mass/(molecular weight)

Thus, moles of KF=x/58

and moles of LiF = (5.97-x)/26LiF=(5.97−x)/26

Thus,

moles of F in KF=moles of KF=x/58 ---(1)

moles of F in LiF =moles of LiF= (5.32-x)/26---(2)

From (1) & (2),

Total moles of Fluorine

=(x/58)+((5.32-x)/26)

Hence,

total weight of Fluorine in sample = moles*Atomic weight

=((x/58)+((5.32-x)/26))*19gms.

=3.12 gms.---(given)

Now, solving the equation for x,

26x +(5.32*58)-58x

=3.12*58*26/19

22x=308.56-247.62

x=60.94/22

=2.77 gms. (Answer)

Thus, the mass of KF in the mixture is 2.77 gms.

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4 years ago

The type of social bonds present in modern societies that are based on difference, interdependence, and individual rights is cal

Goryan [66]

Answer:

Organic Solidarity

Explanation:

3 0

3 years ago