​PROTONS NEUTRONS &

ELECTRONS

Learning Objectives

• I can:

• Explain, in terms of elections, and protons, why a charged object is attracted or repelled by another charged object

• Explain why a charged object can even be attracted to an uncharged object.

• Explain that the attraction between positive protons and negative electrons holds an atom together.

Three particles make up an atom:

Protons, Neutrons and Electrons

Hydrogen is the only atom that usually has NO electrons.

Protons, Neutrons and Electrons

• Protons: Positive charge

• Neutrons: Neutral, charge

• Electrons: Negative charge

• Electrons buzz around the nucleus of an atom

• Proton and Neutrons are found in the nucleus

Demonstration

Demonstration 2

protons, neutrons and electrons

​Understanding IONS and calculating average mass

OBJECTIVES

• Identify the number of protons, neutrons and electrons

• describe ions

• Calculate the average atomic mass of isotopes

three subatomic particles - Protons, neutrons and electrons

​

Calculate the number of protons, neutrons and electrons

​

ions

Ions are charged particles

Isotopes

• Isotopes are atoms of same element with same atomic number but different mass number

Calculation