Electrons

Total number of electrons in the first shell

2

Total number of electrons in the second shell

8

Total number of electrons in the third shell

18

Total number of electrons in the fourth shell

32

An s orbital can hold ? electrons

2

A p orbital can hold ? electrons

2

A d orbital can hold ? electrons

2

An f orbital can hold ? electrons

2

Number of s-orbitals in an s sub-shell?

1

Number of p-orbitals in a p sub-shell?

3

Number of d-orbitals in a d sub-shell?

5

Number of f-orbitals in an f sub-shell?

7

The sub-shells that make up the first shell/energy level are ....

1s

The sub-shells that make up the second shell/energy level are ....

2s & 2p

The sub-shells that make up the third shell/energy level are ....

3s, 3p & 3d

The sub-shells that make up the fourth shell/energy level are ....

4s, 4p, 4d & 4f

The order of filling of the sub-shells (1s-4p)

1s 2s 2p 3s 3p 4s 3d 4p

Definition of an orbital

A region of space outside the nucleus in which up to 2 electrons with opposite spins can be found

Maximum number of electrons that can fit in an s sub-shell?

2

Maximum number of electrons that can fit in a p sub-shell?

6

Maximum number of electrons that can fit in a d sub-shell?

10

Maximum number of electrons that can fit in an f sub-shell?

14