Electronic Configuration

Question 1

Electron shells

Answer 1

Electrons orbit the nucleus along certain pathways called electron shells
The electrons in the inner most shells have the least amount of energy while the outermost electrons have the highest energy.
Electrons will fill the lowest energy shells first.
The maximum number of electrons in a shell can be calculated by the equation 2n² where n=shell number.

Question 2

configuration of electron shells

Answer 2

The first shell can hold a maximum of 2 electrons
The second shell, a maximum of 8
Third shell, a maximum of 8
Fourth shell, a maximum of 18

Question 3

Configuration of an atom

Answer 3

No. protons = No. electrons

Question 4

periodic table configuration

Answer 4

Columns = groups
Rows = periods

Question 5

Valence electrons

Answer 5

The outermost shell that has electrons in it is called the valence shell
The electrons in this shell are called valence electrons
Valence electrons determine how reactive an atom is