Download Structure of Atoms - Harrison County Schools

Jacqulyn Parsons
•An atom is considered the
building blocks of matter.
• Atoms are composed of three
types of particles;
Protons
Neutrons
Electrons
• Protons and
Neutrons are
responsible for
most of the
Atomic Mass.
• Both Protons and
Neutrons reside
inside the
nucleus.
• The Atomic Mass is determined
by adding the number of Protons
and Neutrons together.
# of Protons + # of Neutrons
• Protons have a positive charge. (+)
• Neutrons have no charge or is said
to be neutral. (0)
• Electrons reside in orbitals around
the nucleus and have a negative
charge. (-)
• The number of Protons
determine the number of
Electrons. This number is also
referred to as the Atomic Number.
• Helium:
2 Protons
2 Neutrons
Mass: 2 Protons
2 Neutrons
+ 0.003 Electrons
4.003 total mass
• United Streaming: Standard
Deviants Teaching System:
Chemistry: Module 01: Atomic
Theory and Structure (35:32)