# What are the rules for drawing electron shells?

## What are the rules for drawing electron shells?

How to draw an electron configuration diagram

• Find the element on the periodic table.
• Draw a small circle and write the symbol in the centre.
• Draw a circle around the nucleus.
• Add up to two electrons to the first electron shell.
• Draw another circle around the first shell.
• Add up to eight electrons to the second shell.

What are the rules for number of electrons in electron shells?

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

### What is the correct order for the electron shells?

This gives the following order for filling the orbitals: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, (8s, 5g, 6f, 7d, 8p, and 9s)

How do you fill shells?

Filling in an Aufbau Diagram

1. Determine the number of electrons that the atom has.
2. Fill the s orbital in the first energy level (the 1s orbital) with the first two electrons.
3. Fill the s orbital in the second energy level (the 2s orbital) with the second two electrons.

## How many electrons can shell 4?

32
This model breaks down at the n=3 shell because each shell has subshells. There are 4 subshells, s, p, d, and f. Each subshell can hold a different number of electrons….Search form.

n= Shell Maximum Number of Electrons
2 2nd Shell 8
3 3rd Shell 18
4 4th Shell 32

What is the 2-8-8 electron rule?

Transition metals are able to put more than eight electrons in the shell that is one in from the outermost shell. Think about argon (Ar). It has 18 electrons set up in a 2-8-8 order. Scandium (Sc) is only 3 spots away with 21 electrons, but it has a configuration of 2-8-9-2.

### How do you fill orbital shells?

Electrons will fill the lowest energy orbitals first and then move up to higher energy orbitals only after the lower energy orbitals are full. This is referred to as the Aufbau Principle, after the scientist who proposed the concept.