Spring Break Review
Review Questions
•
•
•
•
•
•
•
What are the parts of an atom?
What does each part do?
What parts of the atom have an electric charge?
What parts of the atom have mass
What does the atomic number tell us?
What does the mass number tell us?
What is an isotope? What happens when an
isotope is unstable?
• What is an ion
What are the parts of an atom?
• The atom consists of protons, neutrons, and
electrons.
• Protons and neutrons are found inside the
nucleus, while electrons are on the outside of
the nucleus
What does each part do?
• A proton has an elementary charge of +1. The
number of protons in an element gives it its
atomic number. Its mass also contributes to the
mass number.
• An electron has an elementary charge of -1. Its
mass is very small compared to a proton and
neutron, so it DOES NOT affect the mass number
• A neutron determines whether the atom is an
isotope. It has NO CHARGE. It also contributes to
an atoms mass number.
What parts of the atom have an
electric charge?
• Protons have a positive charge of +1
• Electrons have a negative charge of -1
• Neutrons have NO CHARGE
What parts of the atom have mass
• Protons and neutrons have the most mass.
Their masses make up the mass number of an
element
• Electrons have a very small mass, so they do
not affect the mass number
• For example, if you won a $5 million lottery
and you lost $1 dollar, you would probably
never notice
What does the atomic number tell us?
• The atomic number tells us the number of
protons in an atom
– What is the atomic number of:
•
•
•
•
•
Hydrogen
Helium
Oxygen
Carbon
Titanium
What does the mass number tell us?
• The mass number tells us the average mass of an
atom
• The mass number consists of protons and
neutrons
• Assuming the atom is stable (same number of
protons and neutrons) what is the mass number
of:
•
•
•
•
•
Hydrogen
Helium
Oxygen
Carbon
Titanium
What is an isotope? What happens
when an isotope is unstable?
• An isotope is when there are changing
numbers of neutrons in the nucleus of an
element.
• For example there is carbon-12, carbon-13,
and carbon-14
• Carbon is the element and the number that
follows it is the mass number
• How many protons and neutrons in each?
• When an isotope is unstable, it breaks down
What is an Ion?
• An ion is when an atom has an uneven
number of protons and electrons.
• This gives the atom a charge
• If a hydrogen atom has 1 proton and no
electrons, what is its charge?
• What if it has 2 electrons, what is its charge