Science 7 Notes 18
1
Identify the
subatomic
particles and their
charges?
Where are the
subatomic
particles located
in an atom?
Atoms
Proton
Neutron
Electron
Atomic Mass
Atomic Number
Structure of an atom:
Atoms are made of smaller particles called subatomic particles:
Protons (positive)
Neutrons (neutral)
Electrons (negative)
Protons and neutrons are located in the nucleus (the center of the
atom).
Electrons are orbiting the nucleus.
The particles of opposite charges are attracted to each other, keeping
electrons near the nucleus
The # of electrons = # of protons
Structure of an Atom
Subatomic
Particle
Location
Charge
Mass
Proton
Nucleus of
the atom
Positive
1 amu
Neutron
Nucleus of
the atom
Neutral
1 amu
Electron
VERY
quickly
orbiting the
nucleus
Negative
Basically no
mass
Describe the
structure of an atom.
Be able to identify
the number of
protons, neutrons,
and electrons in an
atom.
