Chemistry, 08.07.2019 06:00 dukkchild666

Which elements have the quantum numbers (4,3,-2,+1/2) and (5,2,-1,-1/2)

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Answer from: madeleine1102

The elements are Samarium (Sm) and Silver (Ag).

There are four quantum numbers which are used to describe the distribution of electrons in an atom;

The principal quantum number, n which gives the energy levels of the electrons. it has whole number values of 1,2,3,4 and so on.The Azimuthal quantum number or angular momentum (ℓ), which have values of n-1. It gives the number of orbitals in each energy level.The magnetic quantum number or moment (m), which as values of -ℓ to ℓ and gives the number of sub-shells in an orbitalThe Spin quantum number (s) which has values of +½ and -½ and gives the direction of spin of the electrons.

For the first element with quantum numbers (4,3,-2,+1/2);

Principal quantum number n = 4, Azimuthal quantum number, ℓ = 3, Magnetic quantum number, m = -2 and Spin quantum number, s = +½

The element belongs to period 4, has 4f electrons, has electrons in the -2 or sixth sub-orbital spinning in the +½ direction. Therefore, the element is Samarium (Sm).

For the second element with quantum numbers (5,2,-1,-1/2);

Principal quantum number n = 5, Azimuthal quantum number, ℓ = 2, Magnetic quantum number, m = -1 and Spin quantum number, s = -½

The element belongs to period 5, has 4d electrons, has electrons in the -1 or fourth sub-orbital spinning in the -½ direction. Therefore, the element is Silver (Ag).

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Answer from: kassandrarosario1115

The elements are samarium (Sm) and silver (Ag).

Quantum numbers (4,3,-2,+½)

n = 4: Principal quantum number = 4.

l = 3: Element has 4f electrons

It is conventional to list quantum numbers in decreasing order.

Hund’s rule states that all the orbitals must be half-filled with electrons having the same spin before any can receive a second electron.

We get the following table:

Element n l mₗ mₛ

La 4 3 3 +½

Ce 4 3 2 +½

Pr 4 3 1 +½

Nd 4 3 0 +½

Pm 4 3 -1 +½

Sm 4 3 -2 +½

The element is samarium, Sm.

Quantum numbers (5,2,-1,-½)

n = 5: Principal quantum number = 5.

l = 2: Element has 5d electrons

We get the following table:

Element n l mₗ mₛ

Y 5 2 2 +½

Zr 5 2 1 +½

Nb 5 2 0 +½

Mo 5 2 -1 +½

Tc 5 2 -2 +½

Ru 5 2 2 -½

Rh 5 2 1 -½

Pd 5 2 0 -½

Ag 5 2 -1 -½

The element is silver, Ag.

Note: These assignments assume that there are no exceptions in the Periodic Table.

Answer from: Quest

your answer is c) plasma

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Answer from: Quest

answer: mole of the gas

answer: mole of the gasexplanation:

answer: mole of the gasexplanation: this is because 1 mole of a gas is 22.4dm³, which is use in ideal gas

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Which elements have the quantum numbers (4,3,-2,+1/2) and (5,2,-1,-1/2)...

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