Download Subatomic Particles

Subatomic
Particles
Charge
• A proton has a positive (+1) electric charge.
• Neutrons have no electric charge. They are neutral.
• Electrons have a negative (−1) electric charge.
Relative size
• A proton’s relative mass is 1.007 amu
• A neutron’s relative mass is 1.009 amu
• An electron’s relative mass is 0.000549
Atomic Number
• The number of
protons in the
nucleus of an
atom determines
the atomic number
of the element.
Atomic Mass Number
• The number of
protons plus the
number of neutrons
in the nucleus of an
atom equals the
atomic mass
number.
Electrons
• In a stable atom (not an ion) the number of
electrons equals the number of protons in the
nucleus.
• Electrons are set in "orbits" or shells around the
nucleus. Another view is that they form a cloud
around the nucleus.
•Yellow- Beryllium (Be)
•Green- Fluorine (F)
•Blue- Boron (B)
•Black- Lithium (Li)
•Red- Sodium (Na)
Isotopes
• In a different isotope of an atom, the number of neutrons
and atomic mass differ. Number of protons and electrons
stays the same.
• When you see “Oxygen-17” or “Oxygen-18”, the number is
referring to the atomic mass.
• How many protons, neutrons, and electrons does Oxygen18 have?
How many protons, neutrons, and
electrons are in each isotope?