Chemistry, 16.09.2019 04:20 alanrojas0142007

Need with chemistry question
1.) which is not a permissible set of quantum numbers? identify the subshell (if the quantum numbers identify a possible state).
i. n = 2, ℓ = 0, mℓ = 0
ii. n = 3, ℓ = 2, mℓ = 2
iii. n = 2, ℓ = 1, mℓ = –1
iv. n = 3, ℓ = 3, mℓ = 0
v. n = 4, ℓ = 3, mℓ = –3
2.)what is the difference between the 2pz and the 3pz orbitals? which quantum numbers in the orbital designation are different? which will be the same? what does this indicate about the orbitals?
3.)what is the maximum number of electrons that can have n = 3 and ms = + ½ ?

Answers: 1

Show answers

Answers

Answer from: wisal96

This is a multiple question and here are all the answers.

Qestion 1.) Which is not a permissible set of quantum numbers? Identify the subshell (if the quantum numbers identify a possible state).

I. n = 2, ℓ = 0, mℓ = 0

II. n = 3, ℓ = 2, mℓ = 2

III. n = 2, ℓ = 1, mℓ = –1

IV. n = 3, ℓ = 3, mℓ = 0

V. n = 4, ℓ = 3, mℓ = –3

The combination that is not permissible is IV. n = 3, ℓ = 3, mℓ = 0.Se below to identify the subshells.

Explanation:

The electrons are identified by a set of four quantum numbers.

The first quantum number, n, is the principal quantum number and it tells the shell. The second quantum number,ℓ , is the azymuthal quantum number and it tells the subshell.

The letters used to indicate the subshells are:

s: ℓ = 0

p: ℓ = 1

d: ℓ = 2

f: ℓ = 3

The third and fourth quantum numbers are mℓ (magnetic quantum number) and s (spin).

The rules that apply to predict which quantum numbers are possible are:

n: 1, 2, 3, 4, 5, 6, 7 (an integer greater than 0)ℓ: 0, 1, 2, 3, ..., n-1 (an integer less than n)mℓ: an integer from - ℓ to + ℓ s: - 1/2 or +1/2

Two electrons in an atom cannot have the same set of 4 quantum numbers.

With that:

I. n = 2, ℓ = 0, mℓ = 0

This combination of three quantum numbers is permissible, since n is a positive integer, ℓ is less than n, and mℓ is in the interval +ℓ to - ℓ. The combination n = 2 and ℓ = 0 means the subshell is 2p.

II. n = 3, ℓ = 2, mℓ = 2

This combination of three quantum numbers is permissible, since n is a positive integer, ℓ is less than n, and mℓ is in the interval +ℓ to - ℓ. The combination n = 3 and ℓ = 2 means the subshell is 3d.

III. n = 2, ℓ = 1, mℓ = –1

This combination of three quantum numbers is permissible, since n is a positive integer, ℓ is less than n, and mℓ is in the interval +ℓ to - ℓ. The combination n = 2 and ℓ = 1 means the subshell is 2p.

IV. n = 3, ℓ = 3, mℓ = 0

This set of three quantum numbers is not permissible, since ℓ = 3 is not less than n = 3.

V. n = 4, ℓ = 3, mℓ = –3

This set of three quantum numbers is permissible, since n is a positive integer, ℓ is less than n, and mℓ is in the interval +ℓ to - ℓ. The combination n = 4 and ℓ = 3 means the subshell is 4f.

Question 2.)What is the difference between the 2pz and the 3pz orbitals? Which quantum numbers in the orbital designation are different? Which will be the same? What does this indicate about the orbitals?

The difference between 2p_z and 3p_z (note that the letter z is a subscript) is in the first quantum number.

The first quantum number indicates the main energy level and so it is related with the size of the orbital.

So, the 3pz orbital is bigger than the 2pz orbital.

The second quantum number is related to the letter p, so the same letter indicates the same shape of the orbital. Remember the table for the letters used to indicate the subshells are:

s: ℓ = 0

p: ℓ = 1

d: ℓ = 2

f: ℓ = 3

So, the scond quantum number for the two orbitals is ℓ = 1.

The subscript indicates the space orientation. So, since both orbitals have the same subscript, z, they have the same orientation.

In conclusion, the only difference between those orbitals is the size of the orbitals, but they have the same shape and orientation.

3.)What is the maximum number of electrons that can have n = 3 and ms = + ½ ?

9 electrons

Explanation:

Using the rules, for n = 3

ℓ can be 0, 1, or 2; mℓ can be 0 for ℓ = 0, mℓ can be -1, 0, or -1 for for ℓ = 1, and mℓ can be -2, -1, 0, +1, or +2 for ℓ = 2,

You can get the possible sets of quantum numbers (with n = 3):

(3, 0, 0, +1/2)(3, 0, 0, -1/2)(3, 1, 0, +1/2)(3, 1, 0, -1/2)(3, 1, 1, +1/2)(3, 1, 1, -1/2)(3, 1, -1, +1/2)(3, 1, -1, -1/2)(3, 2, 0, +1/2)(3, 2, 0, -1/2)(3, 2, -2, +1/2)(3, 2, -2, -1/2)(3, 2, -1, +1/2)(3, 2, -1, -1/2)(3, 2, 1, +1/2)(3, 2, 1, -1/2)(3, 2, 2, +1/2)(3, 2, 2, -1/2)

So, those are a total of 18 electrons from which half have n = 3 and ms = +1/2.

Hence, 9 electrons can have n = 3 and ms = +1/2.

Answer from: Quest

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

Answer from: Quest

50.23 i believe is correct but don't quote me on that.

Another question on Chemistry

Chemistry, 22.06.2019 07:30

How many atoms are there in 5.70 mol of mg

Answers: 2

Answer

Chemistry, 23.06.2019 09:30

Sheela and her brother hari were sitting in the living room, watching tv. suddenly hari said that he thinks something is burning in the other room. how did he get the burning smell?

Answers: 3

Answer

Chemistry, 23.06.2019 15:40

The table below shows the freezing points of four substances. substance freezing point (°c) benzene 5.5 water 0 butane –138 nitrogen –210 the substances are placed in separate containers at room temperature, and each container is gradually cooled. which of these substances will solidify before the temperature reaches 0°c? benzene water butane nitrogen

Answers: 2

Answer

Chemistry, 23.06.2019 17:10

Which substance produces hydroxide ions in solution? a. an arrhenius acid b. an arrhenius base c. a brønsted-lowry acid d. a brønsted-lowry base e. an amphoteric substance

Answers: 3

Answer

You know the right answer?

Need with chemistry question
1.) which is not a permissible set of quantum numbers? identify...

Questions