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sammy [17]
3 years ago
8

1. Lanthanides and actinides are kept separately in the modern periodic table. Why?

Chemistry
1 answer:
AleksAgata [21]3 years ago
8 0

Answer:

1.. Lanthanides and actinides are kept separately in the modern periodic table Why?

Lanthanides and actinides are kept separately in the modern periodic table because of following reason:

  • If they are placed in the body of the periodic table, the periodic table will become extremely long and hard to recognize
  • more scientific and technical reason why they chose to keep the lanthanides and actinides away from the rest of the periodic table was to help in the grouping of elements in blocks

Explanation:

2. Differentiate between long period and short period in any two points.

Long period:

  • The 4th and 5th periods of the periodic table are called long periods.
  • The long periods coontain 18 elements in them

short period:

  • The 2nd and 3rd periods of the periodic table are called short periods.
  • The short periods contain 8 elements in them
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The following combination of n=3 ; l=1 ; ml=-2 is not allowed. One way to correct this would be by changing the azimuthal quantum number, l and the other way would be to change the magnetic quantum number, m.

<h3>Is the following combination n=3; l=1; ml=-2 allowed or not.? If not, suggest two ways through which it can be corrected.</h3>

The following combination of n=3 ; l=1 ; ml=-2 is not allowed.

There are several rules that need to be followed for assigning electron quantum numbers. They are:

1. Principal quantum number should be 1 ≤ n

2. Azimuthal quantum number, 0 ≤ l ≤ n − 1

3. Magnetic quantum number, -l ≤ ml ≤ l

4. Spin quantum number as either -1/2 or +1/2

For n = 3,

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Therefore, one way to correct the combination would be to change the magnetic quantum number to -1

If we choose l = 2 then ml would be -2, -1, 0, +1, +2

Thus, another way to correct the combination is to choose the azimuthal quantum number as 2.

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To learn more about quantum numbers refer:

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