Pre-lab notes
Atomic number = the number of protons in an atom
Mass number = the number of protons and number of neutrons in an atom
(mass = protons + neutrons)
Can also be used to calculate number of neutrons (mass - protons= neutrons)
HypothesisHow do neutral atoms become ions? (an atom with an a charge)
How do neutral atoms become isotopes? (an atom with a different mass)
1. Neutral Atom of Lithium
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = 7
2. Lithium after losing one electron
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = ______
3. Lithium after gaining 2 electrons
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = ______
4. Neutral Atom of Beryllium
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = 9
5. Beryllium after losing one proton
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = ______
6. Beryllium after gaining 2 protons
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = ______
7. Neutral Atom of Nitrogen
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = 14
8. Nitrogen after losing one neutron
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = ______
9. Nitrogen after gaining 2 neutrons
Draw and Label the atom
# of Protons =______
# of Electrons = ______
# of Neutrons = ______
Atomic # = ______
Mass = ______
1. Besides the element name and symbol what other piece of information could be used to
identify the atom on the periodic table?
2. What effect, besides the quantity, was there on the atom when electrons were gained or
lost?
3. What did NOT change in the atom when electrons were gained or lost?
4. What effect, besides the quantity, was there on the atom when protons were gained or
lost?
5. What did NOT change in the atom when protons were gained or lost?
6. What effect, besides the quantity, was there on the atom when neutrons were gained or
lost?
7. What did NOT change in the atom when neutrons were gained or lost?
8. Which subatomic particles are able to be changed in an atom without changing the type
of atom?