Worksheet Unit 2-4
Name________________________________Period________Date____________
1. The 3 particles of the atom are:
a. ________________________
b. ________________________
c. ________________________
Their respective charges are:
a. ________________________
b. ________________________
c. ________________________
2. The number of protons in one atom is equals to the number of ____________________, and the mass of one proton
is equals to the mass of one __________________ in an atom.
3. The atomic number tells you the number of ___________________________ in one atom of an element. It also tells
you the number of __________________________ in a neutral atom of that element. The atomic number gives the
“identity” of an element as well as its location on the periodic table. No two different elements will have the
____________________ atomic number.
4. The _______________________ of an element is the total number of protons and neutrons in the
___________________ of the atom.
5. The mass number is used to calculate the number of ______________________ in one atom of an element. In order
to calculate the number of neutrons you must subtract the ______________________ from the
______________________.
6. Fill in the missing items in the table below:
Element name
Symbol
# Protons
# Neutrons
# Electrons
Isotope symbol
Iron
16
Ga
35
P
Manganese
7. If you know ONLY the following information can you ALWAYS determine what the element is? (Yes/No)
a. Number of protons ____________________________
b. Number of neutrons ___________________________
c. Number of electrons in a neutral atom ___________________________
d. Number of electrons _________________________
8. Where is the mass of an atom found in the atom (not periodic table)? ______________________________________
9. Where is the volume of an atom found? __________________________________________
10. Are 3H and 3He isotopes of the same element, explain your answer? ______________________________________
_________________________________________________________________________________________________
11. Determine the number of Protons, Neutrons, and Electrons for the following:
Ca-41
109
Cl-34
209
P=
P=
P=
P=
e- =
e- =
e- =
e- =
N=
N=
N=
N=
Ag
Pb
12. What two particles are responsible for making up the mass of an atom? _______________________________
13. What particle is responsible for making up the volume of an atom? __________________________________
14. What is the mass of a(n) Electron: _______________ Proton: ______________ Neutron:_____________
15. What is the difference between an atoms ground state and its excited state? ___________________________
______________________________________________________________________________________
16. What happens when an electron returns to its ground state from its excited state? ______________________
_____________________________________________________________________________________
17. What is a photon? _______________________________________________________________
18. What are the sublevels for the following energy levels:
1: _________
2: _________
3: _________
4: _________
d: _________
f: _________
3: _________
4: _________
19. How many electrons does each sublevel hold?
s: _________
p: _________
20. How many electrons total can each energy level hold?
1: _________
2: _________
21. Fill in the quantum energy level chart.
Energy level (n)
1
2
3
4
Sublevel per energy level
Maximum electrons in
each level