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Nuetrik [128]
3 years ago
10

List four common ions with a valence electron configuration of [Kr]. List the ions in the order of increasing atomic number. Hin

t: two anions and two cations.
Chemistry
1 answer:
chubhunter [2.5K]3 years ago
6 0
<h2> Se^{-2}, Br^{-}, Rb^{+}, Sr^{+2}.</h2>

Explanation:

  • Atomic number of krypton [Kr] =36
  • Electronic configuration of krypton [Kr] = [Ar]3d^{10} 4p^{6}, 2s^{2}
  • Common ions with valence electronic configuration of [Kr] are bromine ion, strontium ion, selenite ion and rubidium ion.
  • The Atomic number of the following ions in increasing order are;

       Se < Br < Rb < Sr

       Se (Z) = 34

       Br (Z) = 35

       Rb (Z) = 37

       Sr (Z) = 38

  • Electronic configuration of the following elements are:

         Se (Z) = [Ar](3d^{10}, 4s^{2}, 5p^{4})

         Br (Z) = [Ar](3d^{10}, 4s^{2}, 5p^{5})

         Rb (Z) = [Kr](5s^{1})

         Sr (Z) = [Kr](5s^{2})

Therefore, the respective ions formed according to theabove electronic configuration are Se^{-2}, Br^{-}, Rb^{+}, Sr^{+2}

Hence the two anions areSe^{-2}, Br{-}

and, the two cations areRb^{+}, Sr{+2}

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I can be found in the 4th period on the periodic table.
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Vanadium (V)

Vanadium is the only one in the 4th period here so

4 0
3 years ago
An empty erlenmeyer flask weighs 241.3 g. when filled with water (d = 1.00 g/cm3), the flask and its contents weigh 489.1 g. wha
g100num [7]

 

The volume of the flask would simply be equal to the volume of the water. And the mass of the water would be the difference after and before weigh.

mass of water = 489.1 g – 241.3 g

mass of water = 247.8 g

 

Therefore the volume of water (which is also the volume of the flask) is:

volume = 247.8 g / (1.00 g/cm^3)

volume = 247.8 cm^3

 

The total mass of the flash when filled with chloroform would be:

total mass with chloroform = 241.3 g + 247.8 cm^3 (1.48 g/cm3)

total mass with chloroform = 608.04 g

 

 

Answers:

volume = 247.8 cm^3

total mass with chloroform = 608.04 g

4 0
3 years ago
What is the name of this branched alkane?
melamori03 [73]
Branched chain alkanes

The alkanes don't contain a functional group and so the branches are numbered from the end that gives the lowest set of position numbers for the branches.

Use the above rules to see how the names of the alkanes below are built up.

The structure of 2-methylbutane is a butane molecule (C4H10) but with a methyl group (CH3) replacing a hydrogen on the second carbon atom in the chain. The structure of 3-methylpentane could be drawn as butane with an ethyl group (C2H5) replacing a hydrogen on the second carbon. Note that this is not 2-ethylbutane. The structure of 2,2-dimethylbutane is butane with two methyl groups replacing the two hydrogens on the second carbon.
4 0
3 years ago
The next three (3) problems deal with the titration of 361 mL of 0.501 M carbonic acid (H2CO3) (Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10
professor190 [17]

Answer:

!

Explanation:

need it too^^

4 0
3 years ago
What mass of cu(s)cu(s) is electroplated by running 14. 5 aa of current through a cu2 (aq)cu2 (aq) solution for 4. 00 hh?
galina1969 [7]

The mass of Copper electroplated is 68.76 g

<h3>What is electroplating?</h3>

The process of plating a metal onto another is known as electroplating.

It is often used to prevent corrosion of metal or for the decorative purposes

In this process, electric current is passed through an aqueous solution containing dissolved cations.

The dissolved cations are reduced developing a thin metal coating on the electrode.

At cathode,

Cu^{2+}(aq) + 2e^-\rightarrow      Cu(s)

Current, I = 14.5 A

Time, t = 4 hrs = 4×60×60 = 14400 sec

Charge, q = It = 14.5×14400= 208800 C

Copper metal deposited by 2×96487 C = 63.55 g

Copper metal deposited by 208800 C = \frac{63.55 \times208800}{2\times96487}

                                                         = 68.76g

Hence, The mass of Copper electroplated is 68.76 g

Learn more about electroplating:

brainly.com/question/22104403

#SPJ4

4 0
1 year ago
Read 2 more answers
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