Bohr Diagrams

NEUTRONS AND PROTONS:

Neutrons and protons are located in the nucleus. Write the number of protons and neutrons inside the nucleus using the symbols ‘p’ and ‘n’.

Number of protons = Atomic Number

Number of neutrons =

Atomic Mass – Atomic Number

ELECTRONS:

Electrons are located in orbitals surrounding the nucleus.

Number of electrons = Number of protons

How many electrons can fit in each orbital?

1^st orbital = 2 electrons

2^nd orbital = 8 electrons

3^rd orbital = 8 electrons

4^th orbital = 18 electrons

Electrons are always in pairs

EXAMPLE:

Chlorine- Cl

Number of Protons (Atomic Number) = 17

Number of Neutrons (Atomic Mass - Atomic Number) (35-17)= 18

Fluorine- F

Number of Protons (Atomic Number)= 19

Number of Neutrons (Atomic Mass - Atomic Number) (19-9)= 10

Aluminum- Al

Number of Protons (Atomic Number)= 13

Number of Neutrons (Atomic Mass - Atomic Number) (27- 13)= 14

http://www.youtube.com/watch?v=iih6rJ2S6pk

By: Krysta Del Rosario :)