Quantum Numbers Flashcards

1
Q

What are the 5 things scientist learned about the Electron?

A
  1. electrons can exist in discrete energy levels called Orbitals.
    2.An Orbital is a mathematical Probability of where the electron is.
    3.Orbitals have different shapes depending on the type of orbital.
  2. An orbital contains 3 variables called quantum Numbers.
  3. These Quantum numbers describe the energy, shape and orientation of the orbitals.
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2
Q

What is the First Quantum Number called?

A

The principle quantum number Symbol is n.

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3
Q

What does the principle quantum number describe?

A

The principle energy level of the orbital. Sometimes referred to as principal shells

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4
Q

What are the values of n

A

The values of n are whole number 1-7
Also n = 1 is the lowest value

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5
Q

What are the 3 things that happen as n increases?

A
  1. The size of the shell increases.
  2. The energy level of the shell increases.
    3.As n increases the number of sub-energy levels(sub shells) increases.
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6
Q

What is the second Quantum Number Called?

A

The angular momentum number and the symbol is l.

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7
Q

What does the angular momentum number identity?

A

The shape of the orbital.

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8
Q

What are the values for l?

A

They depend on the value of n.

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9
Q

what is the lowest value of l?

A

0 if n =1

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10
Q

List the Letter Designations values of l: 0,1,2,3,4,5

A

s , p ,d ,f ,g ,

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11
Q

What do n and l together define?

A

The energy level of an orbital.

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12
Q

The third quantum number is called?

A

The magnetic quantum number. symbol ml

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13
Q

what does the third quantum number tell us?

A

The orientation of the orbital in space.

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14
Q

Values for ml range from?

A

-l….+l

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15
Q

What does l=0

A

means we are looking at an s orbital.

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16
Q

what does the ml values tell us?

A

The number of orbitals in as a given sub energy level.

17
Q

how many electrons can one single orbital have?

A

Can only have 2 electrons.

18
Q

What is the fourth quantum number?

A

The spin quantum number. ms. The ms is independent.

19
Q

what happens if 2 electrons are in a orbital of opposite spin?

A

The magnetic field cancel. Which is diamagnetism

20
Q

What does diamagnetism?

A

The atom will not be attracted to an external magnet.

21
Q

what is paramagnesdism?

A

means the orbital has 1 electron in it, there is a magnetic field. The atom will be attracted to the external magnet.

22
Q

What is the Pauli Exclusion Principle?

A

In a multi-electron atom, no two electrons can have the same set of 4 quantum numbers.