Periodic table - certain no. of atoms in the 1st 4 rows

In summary, the first four rows of the periodic table have 2, 8, 8, and 18 atoms respectively due to the central field approximation and the arrangement of electrons in s, p, d, and f orbitals. This is based on the maximum number of electrons that can occupy each orbital, with the s orbital being able to hold 2 electrons and the p orbital being able to hold 6.
  • #1
Ags Ivana
2
0

Homework Statement


Explain why the first four rows of periodic table have 2, 8, 8 and 18 atoms respectively

Homework Equations


I have a feeling this has something to do with the central field approximation OR the s, p, d, f orbitals and how many electrons can go in each OR something else

The Attempt at a Solution

 
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  • #2
Hello Ivana, :welcome:

What is the context of your question ? Did you learn about the subjects that you have a feeling have to do with this exercise ?
How may electrons can go in an s orbital ? And in a p orbital ?

PS PF guidelines require a real attempt at solution, i.e. a bit more than "a feeling". So pick one and work it out ! :smile:

PS I'm sorry to see your first thread petered out altogether...
 

FAQ: Periodic table - certain no. of atoms in the 1st 4 rows

1. How many elements are in the first four rows of the periodic table?

The first four rows of the periodic table, also known as the s-block and p-block elements, contain a total of 35 elements.

2. Why are there gaps in the first four rows of the periodic table?

The gaps in the first four rows of the periodic table represent elements that have not yet been discovered or have not been officially named and recognized by the scientific community. These gaps also allow for the possibility of new elements to be discovered in the future.

3. What is the maximum number of electrons that can be found in the first four rows of the periodic table?

The maximum number of electrons in the first four rows of the periodic table is 32. This can be seen in the fourth row, which contains the elements potassium, calcium, scandium, and titanium, each with 4 valence electrons.

4. How are elements arranged in the first four rows of the periodic table?

The elements in the first four rows of the periodic table are arranged in order of increasing atomic number. This means that elements with similar properties are grouped together in columns, also known as groups, and elements with different properties are arranged in rows, also known as periods.

5. What is the significance of the first four rows of the periodic table?

The first four rows of the periodic table contain the most commonly known elements and are considered the building blocks of all matter. These elements play crucial roles in chemical reactions and are essential for life on Earth.

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